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Academic literature on the topic 'Fe-Cr-Co magnets'

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Published: 8 June 2024

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Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Journal articles on the topic "Fe-Cr-Co magnets":

1

Jin, S., and G. Chin. "Fe-Cr-Co magnets." IEEE Transactions on Magnetics 23, no. 5 (September 1987): 3187–92. http://dx.doi.org/10.1109/tmag.1987.1065353.

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Liu, Mei-Jiao, Kong-Qiu Hu, Cai-Ming Liu, Ai-Li Cui, and Hui-Zhong Kou. "Metallocyclic Ni4Ln2M2 single-molecule magnets." Dalton Transactions 46, no. 20 (2017): 6544–52. http://dx.doi.org/10.1039/c7dt00948h.

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Magnetic studies on nine new octanuclear cyclic heterotrimetallic complexes reveal that in comparison with analogous octanuclear complexes [Ni4Dy2M2] (M3+ = Fe, W and Co), the [Ni4Dy2Cr2] species show the highest energy barrier and the [Ni4Tb2M2] (M = Cr or Fe) complexes display single-molecule magnetic properties.
3

He, Yazhou, Hao Zhang, Hang Su, Peng Shen, Yaqing Hou, and Dong Zhou. "In Situ Alloying of Fe-Cr-Co Permanent Magnet by Selective Laser Melting of Elemental Iron, Chromium and Cobalt Mixed Powders." Metals 12, no. 10 (September 29, 2022): 1634. http://dx.doi.org/10.3390/met12101634.

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Fe-25Cr-15Co (wt.%) permanent magnets were fabricated via selective laser melting (SLM) and in situ alloying from a blend of Fe, Cr and Co elemental powders. Under the optimal laser scanning process, the as-built Fe-25Cr-15Co alloy has a homogeneous composition distribution without defects such as holes or un-melted particles, and presents a single α phase with the bcc crystal structure. The density of as-built samples was 7.705 g/cm3 (the relative density is 99.32%). The preferred magnetic properties of the sample in the isotropic state were obtained as Hc = 22.84 kA/m, Br = 0.86 T and (BH)max = 7.98 kJ/m3. The hardness and yield strength of Fe-25Cr-15Co permanent magnets are above 331.5 HV and 800 MPa, respectively. The results of this study verified the feasibility of fabricating Fe-Cr-Co permanent magnets by SLM in situ alloying and can be extended to a wide range of applications that require complex shapes with variable magnetic circuit characteristics or gradient structures.
4

Jakubowicz, J., A. Szlaferek, and M. Jurczyk. "Magnetic properties of nanostructured Nd2(Fe,Co,Cr)14B/α-Fe magnets." Journal of Alloys and Compounds 283, no. 1-2 (February 1999): 307–10. http://dx.doi.org/10.1016/s0925-8388(98)00869-x.

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5

Okada, M., R. Togashi, S. Sugimoto, and M. Homma. "Radially induced magnetic anisotropy in Fe‐Cr‐Co permanent magnets." Journal of Applied Physics 64, no. 10 (November 15, 1988): 5732–34. http://dx.doi.org/10.1063/1.342241.

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Ushakova, Olga, and Raisa Malinina. "Structure and Magnetic Properties of Nanocrystalline Fe-Cr-Co Alloys for Permanent Magnets." Solid State Phenomena 190 (June 2012): 238–42. http://dx.doi.org/10.4028/www.scientific.net/ssp.190.238.

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The magnetic properties of alloy containing Fe and 30%Cr, 15 % Co with addition of 3 % Mo after cold rolling were analyzed. It was shown that Hc of Fe-Cr-Co-Mo alloys with cubic texture of recrystallization increases up to 30 %: Hc = 76 kA/m. It was concluded that additional reserves of magnetic properties are created with a more perfect crystallographic and magnetic texture during the recrystallization process.
7

Chen, Zhongmin, Yong Zhang, George C. Hadjipanayis, Qun Chen, and Baomin Ma. "Exchange coupled R2(Fe,Co,Nb)14B/(Fe,Co) (R=Nd,Pr) and Sm2(Fe,Co,Cr)17C2/(Fe,Co) nanocomposite magnets." Journal of Alloys and Compounds 287, no. 1-2 (June 1999): 227–33. http://dx.doi.org/10.1016/s0925-8388(99)00038-9.

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Akbar, S., Z. Ahmad, M. S. Awan, M. Farooque, and A. Ali. "Development of Fe-Cr-Co Permanent Magnets by Single Step Thermo-Magnetic Treatment." Key Engineering Materials 510-511 (May 2012): 507–12. http://dx.doi.org/10.4028/www.scientific.net/kem.510-511.507.

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The present work is focused on a new approach for the development of Fe-Cr-Co based permanent magnets. Fe-Cr-Co alloy was prepared by using tri arc melting technique under inert atmosphere of Argon. Solution treatment was done at a temperature of 1250°C for five hours followed by water quenching and then a single step thermo-magnetic treatment (TMT) was applied at predetermined cooling rates. The influence of TMT and cooling rates on the final magnetic properties of the alloy were investigated. The results reveal that microstructure and magnetic properties were sensitive to both cooling rates & TMT and can be optimized by controlling the processing conditions. The optimum magnetic properties in the alloy with two different cooling rates of 1°C per minute and 2°C per minute were obtained as (i) 1010 Oe (Hc), 9400 G (Br), 3.4 MGOe (BHmax) (ii) 810 Oe (Hc), 10590 G (Br), 3.6 MGOe (BHmax) respectively. The above method provides a quick and low cost manufacturing route for the Fe-Cr-Co based permanent magnets with comparable magnetic properties to that of Alnico with added advantage of having high ductility.
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Efremov, D. B., and A. A. Gerasimova. "Production of magnets from the material of Fe - Cr - Co system by selective laser sintering." Izvestiya. Ferrous Metallurgy 64, no. 10 (November 24, 2021): 721–27. http://dx.doi.org/10.17073/0368-0797-2021-10-721-727.

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The article presents results of the study of possibilities of selective laser melting (SLM), or so-called additive technologies, for production of permanent magnets. This process makes it possible to produce not only product models and prototypes, but also finished functional products using layer-by-layer addition of material and binding of particles and layers to each other. An alloy based on Fe - Cr - Co system has been chosen as the material for evaluation of the compared technologies for permanent magnets production. The application fields of selective laser melting (SLM/SLP) were considered. The powders obtained by different methods are taken for the research. Classical technology of magnetic alloy casting also was analyzed. The studies of magnetic materials and comparisons of the properties of powder magnets with standard data were carried out. On the basis of 25Kh15KA alloy powder sprayed by gas atomization, permanent magnets with a material density of 7.59 - 7.55 g/cm3 can be manufactured at the SLP plant. They meet the requirements recommended by the state standard GOST 24897 - 81, and achieve characteristics of magnets made by classical metallurgical technologies. To study the magnetic and physical properties, four samples were produced with the same geometry in the shape of a cube. During production of each of the test samples, different operating modes of the plant were selected. Samples were made on the basis of the “Kurchatov Institute” NRS enterprise (the “Prometheus” Central Research Institute of Construction Materials) as part of the NIO-35 technological complex. It was established that characteristics of the powders obtained by gas atomization qualitatively exceed characteristics of the powders obtained by other methods, and the produced magnets meet all the requirements for magnets.
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Efremov, D. V., and A. A. Gerasimova. "Production of Fe–Cr–Co-Based Magnets by Selective Laser Sintering." Steel in Translation 51, no. 10 (October 2021): 688–92. http://dx.doi.org/10.3103/s0967091221100028.

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Journal articles

Dissertations / Theses on the topic "Fe-Cr-Co magnets":

1

Domingues, de Sousa Flávia. "Study and modeling of a Fe-Cr-Co magnet based Variable Flux Memory Machine for its supply and mechanical sensorless control at high speed." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0105.

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Les Machines Synchrones à Aimants Permanents (MSAPs) sont largement utilisées pour les applications d'électrification des transports. En produisant son flux magnétique à partir des aimants à base des terres rares (par exemple, Nd-Fe-B), ces machines ont été remise en question ces dernières années en raison des risques d'approvisionnement, de la variabilité des prix et des défis environnementaux liés à ces matériaux magnétiques mentionnés. À ce scénario, s'ajoutent également les limitations d'usage des MSAPs dans de grandes plages de couple-vitesse, nécessitant généralement des stratégies de défluxage, mises en œuvre en imposant une valeur de plus en plus négative à la composant direct du courant statorique à mesure que la machine accélère. Dans le cas de machines à pôles lises, en conséquence du défluxage, les pertes par effet Joule augmentent et le rendement réduit. Capables de fonctionner dans une large plage couple-vitesse, les Machines à Mémoire de Flux Variable (MMFVs) ont émergé comme une option caractérisée par une densité de flux magnétique réglable à partir des impulsions de courant de courte durée alimentant les enroulements de l'armature. Tout cela grâce à la boucle d'hystérésis fortement non linéaire qui caractérise les aimants à faible force coercitive utilisés comme source de flux. Les alliages Al-Ni-Co sont le choix de nombreuses recherches pour ces applications. Des matériaux magnétiques similaires comme le Fe-Cr-Co sont encore peu explorés, malgré leurs avantages comme sa faible teneur en Cobalt et ses propriétés mécaniques. Dans ce cadre, cette thèse propose l'étude d'une MMFV du type simple, avec une paire de pôles et sans enroulement dédié à la magnétisation. La géométrie de la machine est conçue à partir d'une MSAP, pour laquelle un rotor à base des aimants Nd-Fe-B est remplacé par un cylindre massif à base de FeCrCo36/5. Tout d'abord, nous nous concentrons sur l'étude du comportement magnétique de l'aimant lorsqu'il est inséré dans l'environnement de la machine. En raison de l'anisotropie différenciant la boucle d'hystérésis du Fe-Cr-Co dans les directions facile ou difficile d'aimantation, deux méthodologies sont proposées pour décrire le profil d'aimantation partielle via des tests expérimentaux à l'arrêt et des simulations par éléments finis. Les résultats obtenus sont comparés à la référence définie par des mesures à partir d'un équipement idéal (HysteresisGraph). Les effets dû à la géométrie et saturation du stator, et encore, à l'anisotropie de forme, justifient les différences observées. Les études qui suivent sont focalisés sur la magnétisation et le contrôle du couple en dynamique à partir de l'utilisation d'un algorithme de commande sans capteur de position au rotor. Dans ce contexte, cette recherche propose l'implémentation d'une Boucle à Verrouillage de phase du type Proportionnel Intégral pour estimer la position et la vitesse du rotor à partir de la mesure des tensions statoriques. Une attention est portée sur la compensation de l'angle de décalage nécessaire pour ajuster la position mentionnée en fonction du système d'acquisition (filtres actifs) et des caractéristiques de la méthode d'estimation utilisée. Une étude de sensibilité paramétrique identifie les inductances d'axes d et q comme des paramètres critiques pour l'estimation de l'angle de correction. Ainsi, cette thèse s'intéresse également à proposer une méthodologie pour décrire ces inductances à partir simulations par éléments finis. Les effets d'anisotropie de l'aimant et aussi la saturation statorique sont prises en compte. Une réluctance variable est identifiée dans la machine et son impact sur l'angle de correction étudié
Permanent Magnet Synchronous Machines (PMSMs) have been widely used for electrification transportation applications. Producing their magnet flux from rare-earth magnets (e.g. Nd-Fe-B magnets), these machines have had their long-term use increasingly questioned due to the risks of supply, price variability and the environmental challenges related to the extraction and recycling of these mentioned materials. To this scenario, can be also added the limitations of PMSMs for being used in large torque-speed ranges, requiring usually the implementation of flux-weakening strategies, based on supplying the machine with an increasingly negative direct stator current component as the rotor speed also increases. In case of non-salient pole machines the Joule losses can be enhanced and the efficiency consequently reduced. Capable of operating in a wide torque-speed range, the Variable Flux Memory Machines (VFMMs) have emerged as an option characterized by controllable magnetic flux density from short-time currents pulses supplying the armature windings. All this thanks to the highly non-linear hysteresis loop characterizing the low coercive force magnets used as source of flux. Al-Ni-Co alloys has been the choice of many researches for these applications. However, similar magnetic materials as Fe-Cr-Co are still little explored, besides advantageous characteristics as their lower content of Cobalt and mechanical proprieties. Within this framework, this thesis proposes the study of single-type AC-magnetized single pole pair VFMM, composed of a Fe-Cr-Co-based rotor. The machine geometry is designed from a PMSM, in which the rotor pf Nd-Fe-B is directly replaced by a solid cylinder of FeCrCo36/5. First, a focus on the study of the magnetic behavior of the magnet when inserted in the machine environment. Because of the anisotropy differentiating the hysteresis loop of the FeCrCo36/5 in the a easy or hard magnetization directions, two different methodologies are proposed for describing the partial magnetization profile via experimental tests at standstill and Finite Element Analysis simulations. The achieved results are compared with the reference obtained from an ideal measuring equipment (HysteresisGraph). The effects of a stator saturation and geometry as also the anisotropy shape are explored for justifying the differences observed. A following study focused on the magnetization under operation and the torque control is developed considering the an adapted sensorless algorithm. In this context, the present research proposes the use of a Proportional Integral Phase Locked-Loop for estimating the rotor position and speed. An attention is given to the offset angle compensation required for adjusting the mentioned position according to the acquisition system (active filters) and the characteristics of the estimation method used. A parametric sensitivity study allows the identification of the dq-axis inductances as the most critical parameters to an accurate correction angle estimation. For this reason, this research thesis is also interested in proposing a methodology to describe the d- and q-axis inductances from FEA simulations performed by considering the anisotropy effects of the magnet and also the saturation of the stator material. A variable reluctance is identified in the machine and its effect on the correction angle is studied
2

Dottor, Maxime. "Synthesis and characterization of AlM2B2 (M = Cr, Mn, Fe, Co, Ni) : inorganic chemistry." Thesis, Uppsala universitet, Oorganisk kemi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-255853.

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Федченко, Олена Вікторівна, Елена Викторовна Федченко, and Olena Viktorivna Fedchenko. "Структурно-фазовий стан і магнітооптичні властивості плівкових систем на основі Fe, Co, Cr та благородних металів." Thesis, СумДУ, 2013. http://essuir.sumdu.edu.ua/handle/123456789/33736.

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Дисертацію присвячено комплексному дослідженню структурно-фазового стану, магніторезистивних і магнітооптичних властивостей плівкових систем та спін-вентильних структур на основі Fe, Co, Cr та Ag або Au. У роботі визначені оптимальні умови формування плівкових систем та досліджені процеси фазоутворення в них при відпалюванні. Визначені оптимальні загальні концентрації компонент у двошарових системах Fe/Cr (cCr = до 20 ат. %) та Fe/Co (cCo = до 22 ат. %), які забезпечують термічно стабільні, ізотропні та максимальні за величиною магнітні характеристики. Проведені розрахунки коефіцієнтів дифузії для системи Fe/Cr за відомими теоретичними моделями. Визначені найбільш ефективні з них, а саме уточнений метод Уїпла та метод функцій помилок Гауса, які враховують середній розмір зерен та товщину шару матеріалу, що дифундує. Установлена залежність структурного стану та магнітних властивостей двошарових плівок Co/Fe/П від матеріалу підкладки та умов конденсації. Установлена кореляція між структурно-фазовим станом, магніто-резистивними і магнітооптичними властивостями спін-вентильних структур на основі Fe, Co та Au. Запропоновані конфігурації спін-вентилів, які забезпечують найбільш високі за величиною та термічно стабільні магнітні характеристики. При цитуванні документа, використовуйте посилання http://essuir.sumdu.edu.ua/handle/123456789/33736
Диссертация посвящена комплексному исследованию структурно-фазового состояния, магниторезистивных и магнитооптических свойств двухслойных пленочных систем и спин-вентильных структур на основе Fe, Co, Cr и Ag или Au. В работе определены оптимальные условия формирования пленочных систем, которые обеспечивают невысокую дефектность и целостность пленок. Кроме того, исследованы процессы фазообразования в системах при термоотжиге. Определены оптимальные общие концентрации компонент в двухслойных системах Fe/Cr и Fe/Co, которые обеспечивают термически стабильные, изотропные и максимальные по величине магнитные характеристики (магнитосопротивление – МС, индукцию перемагничивания – Bc, индукцию насыщения – Bs). Так, двухслойные пленки на основе Cr и Fe при общей концентрации cCr = 5 – 20 ат. % проявляют наименьшие значения BC (8 – 12 мТл) и наибольший уровень МОКЕ - сигнала в перпендикулярной и продольной геометриях измерения. Увеличение общей концентрации атомов Cr приводит к росту значений BC в продольной геометрии измерения (до BC = 20,5 мТл при cCr = 94 ат. %) и снижению уровня МОКЕ-сигнала в перпендикулярной геометрии. Для двухслойных пленочных систем на основе Fe и Co также характерна зависимость величины и термической стабильности магнитных параметров от концентрации компонент. Так, при cCo = 22 ат. % значения индукции размагничивания для всей системы BC = 13 мТл, а при cCo = 50 ат. % – BC = 8 мТл. Системы с общей концентрацией атомов Co до 22 ат. % проявляют наиболее термически стабильные магнитные свойства во всех геометриях измерения МОКЕ. Проведены расчеты коэффициентов диффузии для системы Fe/Cr по известным теоретическим моделям. Сделаны выводы об эффективности методов Уиппла и функций ошибок Гаусса, которые учитывают средний размер зерна и толщину слоя диффузанта. Исследования двухслойных пленочных систем Co/Fe/П, выращенных на аморфных подложках и на монокристалле (100)MgO, позволили установить зависимость структурного состояния, магниторезистивных и магнитооптических свойств образцов от материала подложки и условий конденсации. Установленно, что при ориентированном росте на монокристалле система проявляет существенную анизотропию МС и Bc. Так, при повороте образца в его плоскости на угол α = 45º значение Bc увеличивается в два раза. Кроме того, образец на подложке (100)MgO имеет большие по величине значения МС во всех геометриях измерения. Установлено, что интенсивность протекания конденсационно-стимулированной диффузии для системы, которая выращена ориентировочно, ниже по сравнению с системой на аморфной подложке. Установлена корреляция между структурно-фазовым состоянием и магнитными свойствами четырех типов спин-вентильных структур на основе Fe, Co и Au. Определено, что для структур, которые имеют относительно толстый (d = 20 нм) слой Co (структуры III и IV типов), при отжиге до температур Tо 600 К изменяется характер зависимости Bc(α), что косвенно свидетельствует о фазообразовании. Установлено, что спин-вентильная структура II типа – Au(3)/Fe(20)/Au(6)/Co(3)/П – проявляет изотропность МС во всех трех геометриях измерения и имеет максимальные по величине термостабильные значения МС. Структура III типа имеет максимальные и наиболее термостабильные значения МС, однако для нее характерны изменения типа непрямого обменного взаимодействия магнитных слоев, что объясняется появлением т. р. (Au,Co) при отжиге. Структуры, которые не имеют относительно толстого слоя Co, не проявляют изменений обменной связи между магнитными слоями. На основе полученных результатов в зависимости от области практического применения предложены конфигурации спин-вентилей, которые обеспечивают наиболее термически стабильные магнитные характеристики. Проведены эллипсометрические исследования спин-вентильных структур, которые полностью подтвердили результаты, полученные с помощью просвечивающей микроскопии относительно структурно-фазового состава образцов. Также позволили определить оптические показатели (n, k) для тонких пленок, которые отличаются от табличных данных для массивных образцов. Кроме того, проведены модельные исследования, позволяющие определить изменения параметров электропереноса пленок Au (Ag), которые выступают в качестве немагнитных прослоек спин-вентилей, при конденсации верхнего слоя Co, Cr и Cu. При цитировании документа, используйте ссылку http://essuir.sumdu.edu.ua/handle/123456789/33736
The thesis is devoted to comprehensive investigation of phase structural state, magneto-optical and magneto-resistive properties of film systems and spin-valve structures on the basis of Fe, Co, Cr, and Ag or Au. This paper contains the study of optimal conditions for formation of the film systems that provide the least imperfection of the samples. Phase formation processes in such systems during annealing were investigated. Optimal general concentration of the components in Fe/Cr (cCr up to 20 at. %) and Fe/Co (cCo up to 22 at. %) bi-layer systems that provide thermally stable, isotropic and the greatest value of magnetic characteristic (magneto resistance – MR, demagnetization induction – Bc, saturation induction – Bs). The computation of diffusion coefficients for Fe/Cr system was carried out with the help of widely used models. Optimal ones were determined: Weeple’s model and Gauss error function, taking into account the grain dimensions and the thickness of diffusant material. The investigation of Au/Co/Fe/Sub film systems showed the dependency of their structural state, magneto-optical and magneto-resistive properties on substrate material and condensation conditions. The correlation between phase structural state and magneto-optical and magneto-resistive properties of spin-valve structures on the basis of Fe, Co and Au was found. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/33736
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JUNQUEIRA, ASTROGILDO de C. "Estudo de interacoes hiperfinas em oxidos perovskitas do tipo La(MT)Osub(3) (MT=metais de transicao Fe, Cr, Mn e Co)." reponame:Repositório Institucional do IPEN, 2004. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11242.

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FAPESP:99/07068-0
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Chang, Hui-Chen, and 張惠貞. "Magnetic Properties of Fe-Cr-Co Thin Film." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/82073754513848072875.

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Huang, Xin-Mao, and 黃信貿. "Study of the Magnetic Properties of (Fe,Co,Cr)/Pt Multilayers." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/07545024181935560325.

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Abstract:
碩士
國立成功大學
材料科學及工程學系碩博士班
92
Different composition of Co-Cr alloy targets were prepared as magnetic layer target, and pure Pt is prepared as spacer layer target. The magnetic layer and spacer layer was coated alternately on Si substrate by Ion Beam sputter. The experimental conditions such as the number of layers, the thickness of each layer, under-layer and heat treatment were the variables in this study. 　　The ratio of elements in the samples is measured by EDS and AES. The structure is analyzed by XRD. SEM and TEM observe the surface morphology and microstructure. The surface roughness of magnetic films was measured by AFM. The magnetic properties of magnetic films were determined by SQUID and MOKE. 　　The experimental results show that the grain sizes of the film are only 7∼8nm, but the additive of under-layer and heat treatment will increase the grain sizes. The best coercivity of non-under-layer film is 84.8Oe for Cr1530s30L, and heat treatment will increase the coercivity to 111Oe. And the best coercivity of Under-layered film is 111.8Oe for PtCr2030s30L, heat treatment will increase the coercivity to 157.9Oe.
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Chen, C. P., and 陳志沛. "Structures and magnetic properties of the nanostructured (Tb1-xDyx) (Mn1-yMy)6Sn6 ribbons (M=Ti, V, Cr, Fe, Co, Ni)." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/60354587595549507476.

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Abstract:
碩士
國立中正大學
物理系
91
The effect of cooling rate on the magnetic properties of nanostructured TbMn6Sn6 ribbons of the HfFe6Ge6 type structure (Space Group:P6/mmm), prepared by melt spinning method, were investigated. The coercivity of TbMn6Sn6 ribbons enhances with increasing the wheel speed (Vs) from 25 to 40 m/s. The optimal magnetic properties of σr = 12.3 emu/g, iHc = 4.7 kOe at room temperature, σr = 11 emu/g and iHc = 58.6 kOe at 5K are obtained in TbMn6Sn6 ribbons quenched at Vs = 35 m/s. Based on x-ray diffraction patterns, the TbMn6Sn6 ribbons mainly consist of 1：6：6─type phase. The average grain size of optimized TbMn6Sn6 robbons (Vs = 35 m/s) is about 25 nm according to transmission electron microscopy (TEM) investigation. Exchange coupling effect between TbMn6Sn6 grains is found, as evidenced by Henkel plot, to exist in all the ribbons at room temperature. It was also tried to substitute Tb with Dy, Mn with transition metals, i.e. Ti, V, Cr, Fe, Co and Ni, in attempts to process nanostructured ribbons. The coercivity, remanence (σr) and Curie temperature of the ribbons under substitution mostly decrease with the increase of substitution volume, except for the Fe substituted alloy ribbons. Its remanence (σr) increases with the increase of Fe contents. Besides, the Curie temperature enhances from 155 ℃ for Fe free alloy ribbons to 170 ℃ for TbMn5.5Fe0.5Sn6.
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Lin, Chuan-Hsiang, and 林川翔. "Electrical and Magnetic Properties of 5-to 6-Component High-Entropy Alloys Made from Al, Co, Cr, Fe, Ni, and Ti." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/86309029842510895111.

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Abstract:
碩士
國立清華大學
材料科學工程學系
96
Al, Co, Cr, Fe, Ni, and Ti are used to make six 5-component and one 6-component high-entropy alloys in this study. As-cast state of these seven bulk alloys is from smelting them in a vacuum arc remelter, while as-homogenized state is to treat the as-cast bulk alloys in a furnace at 1100 °C for 24 h. After the alloys are made, characterization, such as microstructure, electrical and magnetic properties of these 14 samples, is performed. According to results from room-temperature XRD, SEM, EDS and hard-ness measurements and results from 5 K ~ 300 K SQUID for ZFC and FC magnetization curves and 4-probe resistivity vs. temperature measure-ments, we obtain conclusions stated below. Part of as-cast and as-homogenized samples emerges the Heusler intermetallic phase. It has induced that as both Al and Ti contained in the alloys, the total formation enthalpy counted all of the bonds between Al or Ti and one of other elements in the system (i.e., Co, Cr, Fe, and Ni) needs to be so negative that Heusler phase can be formed. That is, in this high-entropy alloy system, both conditions mentioned above suffice the formation of Heusler phase. In other words, one is the presence of both Al and Ti. The other is sufficient negative formation enthalpy. Hardness for all alloys in this study is higher than 500 Hv. This is closely connected with the microstructure. As-cast CoCrFeNiTi, which contains hard HCP phase in microstructure, has the highest hardness of 900 Hv among all alloys in this study. Almost all as-homogenized alloys are harder than their as-cast counterparts. The resistivity for all 14 equi-molar high-entropy alloys in this study is higher than that for conventional binary and ternary alloys. This phenomenon is believed to have something to do with heavy lattice distortion that causes the high diffuse scattering effect of charge carriers. Most samples at low temperatures show the Kondo-like effect. TK of the alloys in this study is higher than that of the high-entropy alloys in previous studies. The temperature coefficient of resistivity of the alloys in this study is the lowest among those have been found at the moment. This is also believed to be due to the heavy lattice distortion of the high-entropy alloys, which causes the lower sensitivity of phonon and resistivity with respect to temperature. High-entropy alloys in this study show ferromagnetic, paramagnetic, and antiferromagnetic properties. By use of the assumption of “average atomic weight” (AAW) for a paramagnetic alloy in Langevin relation for magnetic susceptibility, one can have excellent fitting between Langevin relation and experimental results.
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Wu, Shinn-Horng, and 吳信宏. "The Effect of Co, La or Cr Substitutions on the Microstructure and the Magnetic Properties of the a-Fe/Nd2Fe14B Type Nanocomposites." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/33355711325036298150.

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Lee, Chi-Hung, and 李其紘. "Neutron scattering investigation of complex magnetic transitions in multiferroic Co3TeO6 and core@shell Prussian blue analogue Rb-Co-Fe@K-Ni-Cr nano-cubes." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/78647108134040562226.

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Abstract:
博士
國立中央大學
物理學系
103
There are two parts in my thesis. The first part focuses on the complex magnetic couplings in Co3TeO6. The second part focuses on the magnetic phases in core/shell Prussian blue analogue Rb-Co-Fe@K-Ni-Cr nano-cubes. In the first part, neutron diffraction, magnetic susceptibility, specific heat, and dielectric constant of single crystal cobalt tellurate Co3TeO6 have all been measured to study the interplay between the ferroelectricity, commensurate and incommensurate magnetic ordering developed in the compound. Four critical temperatures are identified. A non-collinear arrangement of the Co spins is found. A negative thermal expansion of the crystalline unit cell is identified when electric polarization develops. Both applied magnetic field and electric field significantly affect the magnetic and electric order parameters as well. These behaviors characterize Co3TeO6 to be a type-II multiferroics. Four magnetic phases have been identified in nano-sized core/shell Prussian blue analogue cubes, with a 250 nm Rb-Co-Fe phase in the core coated by a 45 nm K-Ni-Cr phase on the shell. The stress preserved in the core results in separated CoN6 and FeC6 octahedra, which weaken the magnetism and photo-sensitivity of the core. Three separated magnetic phase transitions at 86, 69 and 67 K are found in the K-Ni-Cr phase on the shell. Two magnetic exchange paths are identified. One propagates along the three crystallographic axis directions. The other propagates along the [110] crystallographic direction for the Ni-Ni ions, but not for the Cr-Cr ions. The severe Cr-deficiency and the appearance of direct Ni-Ni exchange are used to understand the appearance of multiple magnetic phases. The formation of compact CoN6 and FeC6 octahedra weakens the charge transfer between the Fe and Co ions, which results in the development of weak magnetic moments in the core.

Books on the topic "Fe-Cr-Co magnets":

1

Lui, Weixiao. Ferromagnetic resonance analysis of epitaxial Fe/Cr & Co/Mo multilayers. 1995.

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Cao, Gang, and Lance DeLong. Physics of Spin-Orbit-Coupled Oxides. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780199602025.001.0001.

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Abstract:
Prior to 2010, most research on the physics and chemistry of transition metal oxides was dominated by compounds of the 3d-transition elements such as Cr, Mn, Fe, Co, Ni, and Cu. These materials exhibited novel, important phenomena that include giant magnetoresistance in manganites, as well as high-temperature superconductivity in doped La2CuO4 and related cuprates. The discovery in 1994 of an exotic superconducting state in Sr2RuO4 shifted some interest toward ruthenates. Moreover, the realization in 2008 that a novel variant of the classic Mott metal-insulator transition was at play in Sr2IrO4 provided the impetus for a burgeoning group of studies of the influence of strong spin-orbit interactions in “heavy” (4d- and 5d-) transition-element oxides. This book reviews recent experimental and theoretical evidence that the physical and structural properties of 4d- and 5d-oxides are decisively influenced by strong spin-orbit interactions that compete or collaborate with comparable Coulomb, magnetic exchange, and crystalline electric field interactions. The combined effect leads to unusual ground states and magnetic frustration that are unique to this class of materials. Novel couplings between the orbital/lattice and spin degrees of freedom, which lead to unusual types of magnetic order and other exotic phenomena, challenge current theoretical models. Of particular interest are recent investigations of iridates and ruthenates focusing on strong spin-orbit interactions that couple the lattice and spin degrees of freedom.

Book chapters on the topic "Fe-Cr-Co magnets":

1

Kaneko, T., and T. Kanomata. "3.1.4.1 Co-Fe-Cr." In Magnetic Properties of d-Elements, Alloys and Compounds Under Pressure, 49. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41834-1_16.

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Yusupov, V. S., A. I. Milyaev, Galia F. Korznikova, Alexander V. Korznikov, and J. K. Kovneristii. "Structure of Low Cobalt Alloy for Permanent Magnets of Basis System Fe-Cr-Co at Complex Two-Level Loading in Isothermal Conditions." In THERMEC 2006, 2928–33. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-428-6.2928.

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Gao, R. S., L. Zhen, Wen Zhu Shao, X. Y. Sun, D. Y. Zhu, and R. G. Xu. "Magnetic Stability of Fe-Cr-Co Permanent Magnet Materials at High Temperature." In Materials Science Forum, 2135–38. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-960-1.2135.

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Heinrich, B., J. F. Cochran, and M. Kowalewski. "Effective Fields in Magnetic Thin Films: Application to the Co/Cu and Fe/Cr Systems." In Frontiers in Magnetism of Reduced Dimension Systems, 161–210. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5004-0_7.

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Korznikov, Alexander V., Zbigniew Pakiela, Galia F. Korznikova, and Krzysztof J. Kurzydłowski. "The Superplasticity of Hard Magnetic Alloy Fe-23wt.%Co-30%Cr with Submicrocrystalline Structure." In Solid State Phenomena, 69–72. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/3-908451-02-7.69.

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Korznikova, G. F., A. V. Korneva, and A. V. Korznikov. "Formation of Submicrocrystalline Structure in the Hard Magnetic Alloy Fe-15wt.%Co-25%Cr during Straining by Complex Loading." In Nanomaterials by Severe Plastic Deformation, 177–82. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527602461.ch3k.

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Dung, Dang Duc, Nguyen Hoang Thoan, Nguyen Huu Lam, Vu Tien Lam, Nguyen Ngoc Trung, Nguyen Hoang Linh, and Duong Quoc Van. "Magnetic and Optical Properties of Transition Metal (Cr, Mn, Fe, Co, and Ni) Doped Lead-Free Ferroelectric Bi0.5Na0.5TiO3 Materials." In Lecture Notes in Mechanical Engineering, 610–14. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-99666-6_88.

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McFarland, Ben. "Unfolding the Periodic Table." In A World From Dust. Oxford University Press, 2016. http://dx.doi.org/10.1093/oso/9780190275013.003.0007.

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Abstract:
Our starting point is not hidden, nor is it far off. It is not an extreme place like Mono Lake or Freswick Castle, but it is a central concept expressed on a single page. The periodic table is the center of chemistry, and therefore of this book. You can spot it at a distance from its vaguely cathedral-like shape. You can see the chemical symbols that it contains on magnets and T-shirts and restaurant signs. Its regular columns are not quite symmetric, but that is because it has been twisted out of its natural shape by the contingencies of history. Rearrange it just a little and a simple mathematical pattern appears. To see this pattern, imagine that the periodic table is made out of beads on an abacus, arranged in the familiar U shape. Then push all the beads to the left: … Row 1 = H- He Row 2 = Li- Be- B- C- N- O- F- Ne Row 3 = Na- Mg- Al- Si- P- S- Cl- Ar Row 4 = K- Ca- Sc- Ti- V- Cr- Mn- Fe- Co- Ni- Cu- Zn- Ga- Ge- As- Se- Br- Kr Row 5 = Rb- Sr- Y- Zr- Nb- Mo- Tc- Ru- Rh- Pd- Ag- Cd- In- Sn- Sb- Te- I- Xe … By row, there are 2, 8, 8, 18, and 18 elements. The pattern continues in the rows below, but it is obscured by the fact that on most tables 14 elements have been moved out of the sixth and seventh rows. On the table here I have put them where they belong. These rows have 32 elements each. This can be simplified even more. The rows increase, first by 2, then by 6 more (2 + 6 = 8), then by 10 more (2 + 6 + 10 = 18), then by 14 (2 + 6 + 10 + 18 = 32). The series 2, 6, 10, 14 is the doubles of counting up by odd numbers: 1, 3, 5, 7. Put another way, each row is equal to 2n + 1 with n = integers from 0.
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Oliver Mnisi, Bhila, Evans Moseti Benecha, and Meriam Malebo Tibane. "Computational Study of A15 Ru-Based Alloys for High-Temperature Structural Applications." In Ruthenium - An Element Loved by Researchers. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.96578.

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The structural, magnetic, electronic and elastic properties of A15 X3Ru (X = Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn) binary alloys are investigated using first-principles density functional theory (DFT) methods. Ru-based alloys have attracted remarkable research interest due to their unique properties, which make them suitable for high-temperature structural applications. In this chapter, the properties of several A15 Ru-based alloys are investigated in order to select the best suitable alloy/s for aerospace application. Heats of formation are calculated to determine the thermodynamic stability of the materials. Knowledge of the values of elastic constants is essential for understanding the mechanical properties of the materials. From our calculated elastic constants, the bulk modulus, shear modulus, Young’s modulus, Poisson’s ratio, melting temperature, anisotropic factor and the ratio B/G are determined. The electronic density of states are calculated and discussed. Lastly, the magnetic properties of A15 X3Ru alloys are studied. Thermodynamically stable Mn3Ru possesses high-magnetic moment compared to other X3Ru alloys, these results could pave way to experimental realization (synthesis) of Mn3Ru material.
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Ma, Pengjun, Qingfen Geng, and Gang Liu. "Photothermal Conversion Applications of the Transition Metal (Cu, Mn, Co, Cr, and Fe) Oxides with Spinel Structure." In Magnetic Spinels - Synthesis, Properties and Applications. InTech, 2017. http://dx.doi.org/10.5772/67210.

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Conference papers on the topic "Fe-Cr-Co magnets":

1

Sidorov, E. V., N. A. Alekseev, and B. E. Vintaikin. "Commerial single-crystal permanent magnets from alloy Fe-Co-Cr-Mo." In International Conference on Magnetics. IEEE, 1990. http://dx.doi.org/10.1109/intmag.1990.734878.

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Cai-yin You, D. H. Ping, and K. Hono. "Magnetic properties and microstructures of Fe/sub 3/B/Pr/sub 2/Fe/sub 14/B-type nanocomposite magnets with Co and Cr additions." In INTERMAG Asia 2005: Digest of the IEEE International Magnetics Conference. IEEE, 2005. http://dx.doi.org/10.1109/intmag.2005.1464257.

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Gridnev, A. I., V. S. Rastegaaev, and I. P. Stadnik. "Formation of multi-polar crystalline and magnetic grain orientation for manufacturing one-piece rotor magnets from Nd-Fe-B alloy and Fe-Co-Cr single crystals." In International Magnetics Conference. IEEE, 1989. http://dx.doi.org/10.1109/intmag.1989.690233.

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Takahashi, Y., and K. Inomata. "Calculation Of Giant Magnetoresistance In Fe/Cr/Fe And Co/Cr/Co Sandwiches." In 1993 Digests of International Magnetics Conference. IEEE, 1993. http://dx.doi.org/10.1109/intmag.1993.642239.

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Wyslocki, J. J., J. Olszewski, B. Wyslocki, S. Szymura, and J. Wojcik. "Magnetic hardening mechanism in low-cobalt Fe-Cr-Co Alloys." In International Conference on Magnetics. IEEE, 1990. http://dx.doi.org/10.1109/intmag.1990.734877.

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Nakagawa, S., S. Akiyama, M. Sumide, and A. Naoe. "Improvement of magnetic properties and crystallinity of Co-Cr/Ni-Fe double-layer with very thin Co/sub 79/Cr/sub 21/ underlayer." In International Conference on Magnetics. IEEE, 1990. http://dx.doi.org/10.1109/intmag.1990.734328.

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Garganeev, Alexander G., and Dmitry A. Padalko. "Application of Fe-Cr-Co hard magnetic materials as the alternative to Sm-Co and Nd-Fe-B." In 2014 15th International Conference of Young Specialists on Micro/Nanotechnologies and Electron Devices (EDM). IEEE, 2014. http://dx.doi.org/10.1109/edm.2014.6882555.

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Jang, P. W., Y. H. Kim, T. D. Lee, and T. Kang. "Role of a Co/sub 83/Cr/sub 27/ seed layer in CoCr/Ni-Fe medium." In International Magnetics Conference. IEEE, 1989. http://dx.doi.org/10.1109/intmag.1989.690347.

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Chaudhary, V., Y. Zhong, H. Parmar, X. Tan, and R. V. Ramanujan. "Low spin reorientation transition temperature, high coercivity, Nd2(Fe,Co,Cr)14B based hard magnetic nanoparticles." In 2018 IEEE International Magnetic Conference (INTERMAG). IEEE, 2018. http://dx.doi.org/10.1109/intmag.2018.8508544.

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Nakagawa, S., K. Suemitsu, and M. Naoe. "Improvement Of Soft Magnetic Properties Of Ferromagnehc Fe-Co-Ta:N/M Films Multilayered With Paramagneitc Ti, Co/sub 67/Cr/sub 33/and Fe/sub 82/Co/sub 9/Ta/sub 9/ Interlayers." In 1997 IEEE International Magnetics Conference (INTERMAG'97). IEEE, 1997. http://dx.doi.org/10.1109/intmag.1997.597932.

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