Готові списки джерел за темами / Ferromagnetic Heusler alloys

Добірка наукової літератури з теми "Ferromagnetic Heusler alloys"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 29 січня 2023

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Статті в журналах з теми "Ferromagnetic Heusler alloys"

1

Srivastava, Vijay, and Kanwal Preet Bhatti. "Ferromagnetic Shape Memory Heusler Alloys." Solid State Phenomena 189 (June 2012): 189–208. http://dx.doi.org/10.4028/www.scientific.net/ssp.189.189.

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Анотація:
Although Heusler alloys have been known for more than a century, but since the last decade there has been a quantum jump in research in this area. Heusler alloys show remarkable properties, such as ferromagnetic shape memory effect, magnetocaloric effect, half metallicity, and most recently it has been shown that it can be used for direct conversion of heat into electricity. Heusler alloys Ni-Mn-Z (Z=Ga, Al, In, Sn, Sb), show a reversible martensitic transformation and unusual magnetic properties. Other classes of intermetallic Heusler alloy families that are half metallic (such as the half Heusler alloys Ni-Mn-Sb and the full Heusler alloy Co2MnGe) are attractive because of their high Curie temperature and structural similarity to binary semiconductors. Unlike Ni-Mn-Ga, Ni-Mn-In and Ni-Mn-Sn transform from ferromagnetic austenite to non-ferromagnetic martensite. As is consistent with the Clausius-Clapeyron equation, the martensitic phase transformation can be manipulated by a magnetic field, leading to possible applications of these materials enabling the magnetic shape memory effect, energy conversion and solid state refrigeration. In this paper, we summarize the salient features of Heusler alloys, like the structure, magnetic properties and potential application of this family of alloys in industry.
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2

Sakon, Takuo, Yuhi Hayashi, Akihito Fukuya, Dexin Li, Fuminori Honda, Rie Umetsu, Xiao Xu, Gendo Oomi, Takeshi Kanomata, and Tetsujiro Eto. "Investigation of the Itinerant Electron Ferromagnetism of Ni2+xMnGa1−x and Co2VGa Heusler Alloys." Materials 12, no. 4 (February 14, 2019): 575. http://dx.doi.org/10.3390/ma12040575.

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Анотація:
Experimental investigations into the field dependence of magnetization and temperature dependences of magnetic susceptibility in Ni2+xMnGa1−x (x = 0.00, 0.02, 0.04) and Co2VGa Heusler alloy ferromagnets were performed following the spin fluctuation theory of itinerant ferromagnetism, called as “Takahashi theory”. We investigated the magnetic field dependence of magnetization at the Curie temperature TC, which is the critical temperature of the ferromagnetic–paramagnetic transition, and also at T = 5 K, which concerns the ground state of the ferromagnetic state. The field dependence of the magnetization was analyzed by means of the H vs. M5 dependence, and the field dependence of the ground state at 5 K was investigated by means of an Arrott plot (H/M vs. M2) according to the Takahashi theory. As for Ni2+xMnGa1−x, the spin fluctuation parameter in k-space (momentum space, TA) and that in energy space (T0) obtained at TC and 5 K were almost the same. On the contrary, as for Co2VGa, the H vs. M5 dependence was not shown at TC. We obtained TA and T0 by means of an Arrott plot at 5 K. We created a generalized Rhodes–Wohlfarth plot of peff/pS versus TC/T0 for the other ferromagnets. The plot indicated that the relationship between peff/pS and T0/TC followed Takahashi’s theory. We also discussed the spontaneous magnetic moment at the ground state, pS, which was obtained by an Arrott plot at 5 K and the high temperature magnetic moment, pC, at the paramagnetic phase. As for the localized ferromagnet, the pC/pS was 1. As for weak ferromagnets, the pC/pS was larger than 1. In contrast, the pC/pS was smaller than 1 by many Heusler alloys. This is a unique property of Heusler ferromagnets. Half-metallic ferromagnets of Co2VGa and Co2MnGa were in accordance with the generalized Rhodes–Wohlfarth plot with a km around 1.4. The magnetic properties of the itinerant electron of these two alloys appeared in the majority bands and was confirmed by Takahashi’s theory.
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3

Planes, Antoni, and Lluís Mañosa. "Ferromagnetic Shape-Memory Alloys." Materials Science Forum 512 (April 2006): 145–52. http://dx.doi.org/10.4028/www.scientific.net/msf.512.145.

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Анотація:
The magnetic shape-memory effect is a consequence of the coupling between magnetism and structure in ferromagnetic alloys undergoing a martensitic transformation. In these materials large reversible strains can be magnetically induced by the rearrangement of the martensitic twin-variant structure. Several Heusler and intermetallic alloys have been studied in connec- tion with this property. In this paper we will focus on the Ni-Mn-Ga Heusler alloy which is considered to be the prototypical magnetic shape-memory alloy. After a brief summary of the general properties of this class of materials, we will present recent results of relevance for the understanding of the effect of magnetism on the martensitic transformation. Finally, we will discuss the requirements for the occurrence of the magnetic shape-memory effect.
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4

Oogane, M., and S. Mizukami. "Tunnel magnetoresistance effect and magnetic damping in half-metallic Heusler alloys." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 369, no. 1948 (August 13, 2011): 3037–53. http://dx.doi.org/10.1098/rsta.2011.0011.

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Анотація:
Some full-Heusler alloys, such as Co 2 MnSi and Co 2 MnGe, are expected to be half-metallic ferromagnetic material, which has complete spin polarization. They are the most promising materials for realizing half-metallicity at room temperature owing to their high Curie temperature. We demonstrate a huge tunnel magnetoresistance effect in a magnetic tunnel junction using a Co 2 MnSi Heusler alloy electrode. This result proves high spin polarization of the Heusler alloy. We also demonstrate a small magnetic damping constant in Co 2 FeAl epitaxial film. The very high spin polarization and small magnetic constant of Heusler alloys will be a great advantage for future spintronic device applications.
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5

S, Aksoy, Posth O, Acet M, Meckenstock R, Lindner J, Farle M, and Wassermann E. F. "Ferromagnetic resonance in Ni-Mn based ferromagnetic Heusler alloys." Journal of Physics: Conference Series 200, no. 9 (January 1, 2010): 092001. http://dx.doi.org/10.1088/1742-6596/200/9/092001.

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6

Benichou, Boucif, Zakia Nabi, Badra Bouabdallah, and Halima Bouchenafa. "Structural, elastic, electronic and magnetic properties of quaternary Heusler alloy Cu2MnSi1-xAlx (x = 0 - 1): First-principles study." Revista Mexicana de Física 64, no. 2 (March 14, 2018): 135. http://dx.doi.org/10.31349/revmexfis.64.135.

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Анотація:
We investigate the structural, elastic, electronic and magnetic properties of the Heusler compounds Cu2MnSi, Cu2MnAl and Cu2MnSi1-xAlx quaternary alloys, using the full-potential linear-augmented plane-wave method (FP-LAPW) in the framework of the density functional theory (DFT) using the generalized gradient approximation of Perdew-Burke-Ernzerhof (GGA-PBE). Our results provide predictions for the quaternary alloy Cu2MnSi1-xAlx (x = 0.125, 0.25, 0.375, 0.5) in which no experimental or theoretical data are currently available. We calculate the ground state’s properties of Cu2MnSi1-xAlx alloys for both nonmagnetic and ferromagnetic configurations, which lead to ferromagnetic and metallic compounds. Also, the calculations of the elastic constants and the elastic moduli parameters show that these quaternary Heusler alloys are ductile and anisotropic.
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7

Entel, Peter, Markus E. Gruner, Antje Dannenberg, Mario Siewert, Sanjeev K. Nayak, Heike C. Herper, and Vasiliy D. Buchelnikov. "Fundamental Aspects of Magnetic Shape Memory Alloys: Insights from Ab Initio and Monte Carlo Studies." Materials Science Forum 635 (December 2009): 3–12. http://dx.doi.org/10.4028/www.scientific.net/msf.635.3.

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Анотація:
Ferromagnetic Heusler alloys like Ni-Mn-Z (Z = Al, Ga, In, Sn, Sb), which undergo a martensitic phase transformation, are on the edge of being used in technological applications involving actuator and magnetocaloric devices. The other class of ferromagnetic full Heusler alloys like Co-Mn-Z (Z = Al, Si, Ga, Ge, Sn) not undergoing a structural phase transition, are half-metals (in contrast to the Ni-based systems) with high spin polarization at the Fermi level and are of potential importance for future spintronics devices. On the basis of recent ab initio calculations, we highlight the main differences between the two classes of Heusler based materials.
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8

Ahamed, Riaz, Reza Ghomashchi, Zonghan Xie, and Lei Chen. "Powder Metallurgy Synthesis of Heusler Alloys: Effects of Process Parameters." Materials 12, no. 10 (May 15, 2019): 1596. http://dx.doi.org/10.3390/ma12101596.

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Анотація:
Ni45Co5Mn40Sn10 Heusler alloy was fabricated with elemental powders, using a powder processing route of press and sinter, in place of vacuum induction melting or arc melting route. The effects of process parameters, such as compaction load, sintering time, and temperature, on the transformation characteristics and microstructures of the alloy were investigated. While the effect of compaction pressure was not significant, those of sintering time and temperature are important in causing or annulling martensitic transformation, which is characteristic of Heusler alloys. The processing condition of 1050 °C/24 h was identified to be favorable in producing ferromagnetic Heusler alloy. Longer durations of sintering resulted in an increased γ-phase fraction, which acts as an impediment to the structural transformation.
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9

Tsuchiya, Koichi, Katsunari Oikawa, Takashi Fukuda, and Tomoyuki Kakeshita. "Ferromagnetic Shape Memory Alloys with Heusler Structure." Materia Japan 44, no. 8 (2005): 642–47. http://dx.doi.org/10.2320/materia.44.642.

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Wen, Zhenchao, Zhiyong Qiu, Sebastian Tölle, Cosimo Gorini, Takeshi Seki, Dazhi Hou, Takahide Kubota, Ulrich Eckern, Eiji Saitoh, and Koki Takanashi. "Spin-charge conversion in NiMnSb Heusler alloy films." Science Advances 5, no. 12 (December 2019): eaaw9337. http://dx.doi.org/10.1126/sciadv.aaw9337.

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Анотація:
Half-metallic Heusler alloys are attracting considerable attention because of their unique half-metallic band structures, which exhibit high spin polarization and yield huge magnetoresistance ratios. Besides serving as ferromagnetic electrodes, Heusler alloys also have the potential to host spin-charge conversion. Here, we report on the spin-charge conversion effect in the prototypical Heusler alloy NiMnSb. An unusual charge signal was observed with a sign change at low temperature, which can be manipulated by film thickness and ordering structure. It is found that the spin-charge conversion has two contributions. First, the interfacial contribution causes a negative voltage signal, which is almost constant versus temperature. The second contribution is temperature dependent because it is dominated by minority states due to thermally excited magnons in the bulk part of the film. This work provides a pathway for the manipulation of spin-charge conversion in ferromagnetic metals by interface-bulk engineering for spintronic devices.
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Більше джерел

Дисертації з теми "Ferromagnetic Heusler alloys"

1

Bargawi, Ahmad Yousef. "A study of the martensitic phase transition in the shape memory alloy Ni₂MnGa." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/32824.

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Анотація:
A study of the martensitic phase transition in the shape memory alloy Ni2MnGa has been carried out. Ni2MnGa is one of the group of "shape memory effect" alloys which are currently exciting considerable interest. The origin of this effect in the compound is in the phase change which takes place on cooling through T = 200 K from the cubic L21 Heusler structure to a tetragonal phase. Recently the results of band structure calculations have been used to conclude that in Ni2MnGa the structural phase transition is driven by a band Jahn-Teller distortion.
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2

Khan, Mahmud. "Magnetic entropy changes and exchange bias effects associated with phase transitions in ferromagnetic Heusler alloys /." Available to subscribers only, 2007. http://proquest.umi.com/pqdweb?did=1456294961&sid=5&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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3

Gaucher, Samuel. "Growth of lattice-matched hybrid semiconductor-ferromagnetic trilayers using solid-phase epitaxy." Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/22599.

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Анотація:
Diese Arbeit befasst sich mit dem Wachstum von Dünnschichtstrukturen, die zur Herstellung eines Spin-selektiven Schottky-Barrier-Tunneltransistors (SS-SBTT) erforderlich sind. Das Bauelement basiert auf dem Transport von Ladungsträgern durch eine dünne halbleitende (SC) Schicht, die zwei ferromagnetische (FM) Kontakte trennt. Daher müssen hochqualitative und gitterangepasste vertikale FM/SC/FM-Trilayer gezüchtet werden, was aufgrund der inkompatiblen Kristallisationsenergien zwischen SC und Metallen eine experimentelle Herausforderung darstellt. Das Problem wurde mit einem Festphasenepitaxie-Ansatz gelöst, bei dem eine dünne amorphe Ge-Schicht (4-8 nm) durch Ausglühen über Fe3Si auf GaAs(001)-Substraten kristallisiert wird. Langsame Glühgeschwindigkeiten bis zu einer Temperatur von 260°C konnten ein neues gitterangepasstes Polymorph von FeGe2 erzeugen, über das ein zweites Fe3Si mittels Molekularstrahlepitaxie gezüchtet werden könnte. SQUID-Magnetometermessungen zeigen, dass die dreischichtigen Proben in antiparallele Magnetisierungszustände versetzt werden können. Vertikale Spin-Ventil-Bauelemente, die mit verschiedenen Trilayern hergestellt wurden, wurden verwendet, um zu demonstrieren, dass der Ladungstransport über die Heteroübergänge spinselektiv ist und bei Raumtemperatur einen Magnetowiderstand von höchstens 0,3% aufweist. Der Effekt nimmt bei niedrigen Temperaturen ab, was mit einem ferromagnetischen Übergang in der FeGe2-Schicht korreliert. Durch TEM- und XRD-Experimente konnte festgestellt werden, dass das neue FeGe2-Polymorph die Raumgruppe P4mm aufweist und bis zu 17% Si-Atome als Ersatz für Ge-Stellen enthält. Die Isolierung von FeGe2 war möglich, indem das Verhältnis von Fe-, Si- und Ge-Atomen so eingestellt wurde, dass die richtige Stöchiometrie bei vollständiger Durchmischung erreicht wurde. Anhand von FeGe2-Dünnschichten wurde ein zunehmender spezifischer Widerstand bei niedriger Temperatur und ein semi-metallischer Charakter beobachtet.
This thesis discusses the growth of thin film structures required to fabricate a Spin-Selective Schottky Barrier Tunnel transistor (SS-SBTT). The device relies on charge carriers being transported through a thin semiconducting (SC) layer separating two ferromagnetic (FM) contacts. Thus, high quality and lattice-matched FM/SC/FM vertical trilayers must be grown, which is experimentally challenging due to incompatible crystallization energies between SC and metals. The problem was solved using a solid-phase epitaxy approach, whereby a thin amorphous layer of Ge (4-8 nm) is crystallized by annealing over Fe3Si on GaAs(001) substrates. Slow annealing rates up to a temperature of 260°C could produce a lattice-matched Ge-rich compound, over which a second Fe3Si could be grown my molecular-beam epitaxy. The compound obtained during annealing is a new layered polymorph of FeGe2. SQUID magnetometry measurements indicate that the trilayer samples can be placed in states of antiparallel magnetization. Vertical spin valve devices created using various trilayers were used to demonstrate that charge transport is spin-selective across the heterojunctions, showing a magnetoresistance of at most 0.3% at room temperature. The effect decreases at low temperature, correlating with a ferromagnetic transition in the FeGe2 layer. TEM and XRD experiments could determine that the new FeGe2 polymorph has a space group P4mm, containing up to 17% Si atoms substituting Ge sites. Isolating FeGe2 was possible by tuning the proportion Fe, Si and Ge atoms required to obtain the right stoichiometry upon full intermixing. Hall bars fabricated on FeGe2 thin films were used to observe an increasing resistivity at low temperature and semimetallic character.
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4

Dannenberg, Antje [Verfasser], Peter [Akademischer Betreuer] Entel, and Jörg [Akademischer Betreuer] Neugebauer. "Ab initio and Monte Carlo investigations of structural, electronic and magnetic properties of new ferromagnetic Heusler alloys with high Curie temperatures / Antje Dannenberg. Gutachter: Peter Entel ; Jörg Neugebauer." Duisburg, 2011. http://d-nb.info/1016614985/34.

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5

Singh, Laura Jane. "Co₂MnSi Heusler alloy thin films." Thesis, University of Cambridge, 2005. https://www.repository.cam.ac.uk/handle/1810/34601.

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Анотація:
This thesis investigates the growth of intermetallic compounds by co-sputtering from single elemental targets. The preliminary work involved constructing a sputtering set-up to grow abinary alloy (Sm-Co) and investigating how to control the composition spread that was obtained. Having achieved this, a larger sputtering flange was built up to grow the ternary Heusler alloy, Co₂MnSi. Co₂MnSi has been predicted to be a half-metallic ferromagnet, which means that there is an energy gap in the minority spin band at the Fermi energy. This leads to 100% spin polarised conduction electrons, which would enable ideal spin-device performance to be obtained. Co₂MnSi is particularly promising because it is predicted to have a large energy gap in the minority band of ~0.4 eV and has the highest Curie temperature among the known Heuslers of 985 K. Initially, Co₂MnSi was grown on a-plane sapphire and stoichiometric films were single phase and highly (110) textured, without the use of a seed layer. They exhibited the bulk value of the saturation magnetisation, Ms and films grown at the highest deposition temperature (715 K) showed the lowest resistivity (47 μΩcm at 4.2 K) and the lowest room temperature coercivity (18 Oe). The spin polarisation of the transport current, Pt of a 400 nm film grown at this deposition temperature was 54%, consistent with measurements on bulk single crystals. Ms decreased with decreasing film thickness indicating a graded disorder. By growing on GaAs (001), which has a similar lattice parameter to Co₂MnSi it was expected that this disordered region would be confined to the first few atomic layers. However, this was not the case because interfacial reactions resulted in the formation of an epitaxial Mn-As region, and a thin interfacial layer that was Co-Ga rich. This prevented the lattice matching of the Co₂MnSi to the GaAs(001) hence hindering epitaxial growth of the Heusler. The reaction zone also meant that films exhibited a Ms slightly below the bulk value. The expected fourfold anisotropy was not obtained for this cubic material, which is most likely due to the anisotropy of the reconstructed GaAs surface. Inspite of this anomalous behaviour, Pt was 55%, similar to the result obtained on sapphire, indicating that either Pt is independent of orientation or that the Heusler surface reconstructs in the same way. Films showed some improved properties to films grown on a-plane sapphire, indicating the potential of growing on this technologically important substrate. With this in mind, pseudo spin valves involving Co₂MnSi as one of the ferromagnetic electrodes were fabricated in both the CIP and CPP configurations. Clear low-field spin-valve contributions were observed at 15 K but the MR values are much lower than that expected from a PSV with a predicted 100% spin polarised electrode.
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6

Parsons, Mark James. "An investigation of the thermal properties of some strongly correlated electron systems." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/27183.

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The correlated electron systems which are the subject of this thesis are the strong electron–phonon coupling superconductor HfV2, and the localised moment magnetic systems of the alloy series Pd2REIn (RE = Gd, Tb, Ho, Er and Yb).
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7

Muduli, Pranaba Kishor. "Ferromagnetic thin films of Fe and Fe 3 Si on low-symmetric GaAs(113)A substrates." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2006. http://dx.doi.org/10.18452/15473.

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Анотація:
In dieser Arbeit werden das Wachstum mittels Molekularstrahlepitaxie und die Eigenschaften der Ferromagneten Fe und Fe_3Si auf niedrig-symmetirschen GaAs(113)A-Substraten studiert. Drei wichtige Aspekte werden untersucht: (i) Wachstum und strukturelle Charakterisierung, (ii) magnetische Eigenschaften und (iii) Magnetotransporteigenschaften der Fe und Fe_3Si Schichten auf GaAs(113)A-Substraten. Das Wachstum der Fe- und Fe_3Si-Schichten wurde bei einer Wachstumstemperatur von = bzw. 250 °C optimiert. Bei diesen Wachstumstemperaturen zeigen die Schichten eine hohe Kristallperfektion und glatte Grenz- und Oberflächen analog zu [001]-orientierten Schichten. Weiterhin wurde die Stabilität der Fe_(3+x)Si_(1-x) Phase über einen weiten Kompositionsbereich innerhalb der Fe_3Si-Stoichiometry demonstriert. Die Abhängigkeit der magnetischen Anisotropie innerhalb der Schichtebene von der Schichtdicke weist zwei Bereiche auf: einen Beresich mit dominanter uniaxialer Anisotropie für Fe-Schichten = 70 MLs. Weiterhin wird eine magnetische Anisotropie senkrecht zur Schichtebene in sehr dünnen Schichten gefunden. Der Grenzflächenbeitrag sowohl der uniaxialen als auch der senkrechten Anisotropiekonstanten, die aus der Dickenabhängigkeit bestimmt wurden, sind unabhängig von der [113]-Orientierung und eine inhärente Eigenschaft der Fe/GaAs-Grenzfläche. Die anisotrope Bindungskonfiguration zwischen den Fe und den As- oder Ga-Atomen an der Grenzfläche wird als Ursache für die uniaxiale magnetische Anisotropie betrachtet. Die magnetische Anisotropie der Fe_3Si-Schichten auf GaAs(113)A-Substraten zeigt ein komplexe Abhängigkeit von der Wachstumsbedingungen und der Komposition der Schichten. In den Magnetotransportuntersuchungen tritt sowohl in Fe(113)- als auch in Fe_3Si(113)-Schichten eine antisymmetrische Komponente (ASC) im planaren Hall-Effekt (PHE) auf. Ein phänomenologisches Modell, dass auf der Kristallsymmetrie basiert, liefert ein gute Beschreibung sowohl der ASC im PHE als auch des symmetrischen, anisotropen Magnetowiderstandes. Das Modell zeigt, dass die beobachtete ASC als Hall-Effekt zweiter Ordnung beschreiben werden kann.
In this work, the molecular-beam epitaxial growth and properties of ferromagnets, namely Fe and Fe_3Si are studied on low-symmetric GaAs(113)A substrates. Three important aspects are investigated: (i) growth and structural characterization, (ii) magnetic properties, and (iii) magnetotransport properties of Fe and Fe_3Si films on GaAs(113)A substrates. The growth of Fe and Fe_3Si films is optimized at growth temperatures of 0 and 250 degree Celsius, respectively, where the layers exhibit high crystal quality and a smooth interface/surface similar to the [001]-oriented films. The stability of Fe_(3+x)Si_(1-x) phase over a range of composition around the Fe_3Si stoichiometry is also demonstrated. The evolution of the in-plane magnetic anisotropy with film thickness exhibits two regions: a uniaxial magnetic anisotropy (UMA) for Fe film thicknesses = 70 MLs. The existence of an out-of-plane perpendicular magnetic anisotropy is also detected in ultrathin Fe films. The interfacial contribution of both the uniaxial and the perpendicular anisotropy constants, derived from the thickness-dependent study, are found to be independent of the [113] orientation and are hence an inherent property of the Fe/GaAs interface. The origin of the UMA is attributed to anisotropic bonding between Fe and As or Ga at the interface, similarly to Fe/GaAs(001). The magnetic anisotropy in Fe_3Si on GaAs(113)A exhibits a complex dependence on the growth conditions and composition. Magnetotransport measurements of both Fe(113) and Fe_3Si(113) films shows the striking appearance of an antisymmetric component (ASC) in the planar Hall effect (PHE). A phenomenological model based on the symmetry of the crystal provides a good explanation to both the ASC in the PHE as well as the symmetric anisotropic magnetoresistance. The model shows that the observed ASC component can be ascribed to a second-order Hall effect.
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8

Topbasi, Cem. "Theoretical And Experimental Investigations On Atomic And Magnetic Ordering In Full Heusler Alloys." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609640/index.pdf.

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Анотація:
The aim of the study, which was carried out in two main parts, was to investigate the atomic and magnetic ordering in various full Heusler alloy systems.In the theoretical part of the thesis, investigations based on the statiscothermodynamical theory of ordering by means of Bragg-Williams-Gorsky (BWG) method combined with electronic theory in the pseudopotential approximation have been conducted to model order-order (L21&
#8596
B2) and order-disorder (B2&
#8596
A2) phase transformations in Ni-Mn-C (C=Ga, In, Sb) and A2BGa (A=Fe, Ni, Co
B=Ni, Mn, Co, Fe) Heusler alloys. The partial ordering energies, calculated according to the electronic theory of alloys in pseudopotential approximation for the first two coordination spheres were utilized as input data for the theoretical superlattice formation models based on BWG approximation. Furthermore, the trends of L21&
#8596
B2 transition temperatures with electron concentration at A, B and C atomic sites were determined. In the experimental part of the thesis, structural and magnetic properties of Ni-Mn-Ga and Ni-Mn-Al Heusler alloys were investigated. For the Ni-Mn-Ga Heusler alloy system, it was found that the martensitic (TM) and Curie temperatures (TC) merge for Ni54Mn20Ga26 and Ni56Mn18Ga26 alloys by compositional tuning. For the Ni-Mn-Al Heusler alloy system, it was found that ferromagnetism was introduced into these alloys by low temperature aging, as a result of the stabilization of the L21 phase. In addition to that, magnetocaloric effect (MCE) was determined in the vicinity of the first order magneto-structural transition for Ni-rich Ni-Mn-Ga alloys and near the second order magnetic transition for the Ni2MnAl alloy.
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9

PENDL, JUNIOR WILLI. "Estudo do campo hiperfino magnetico no sup181Ta no sitio Y das ligas de Heusler Cosub2 YAI (Y=Ta, Cr) e Cosub2 Ysup1sup1sub1-xYsup2subxZ (Y=Ti,V,Nb,Cr e Z=Al,Sn)." reponame:Repositório Institucional do IPEN, 1996. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10444.

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IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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KOUACOU, ABAKA MICHEL. "Apparition du ferromagnetisme itinerant dans des composes de type heusler. Relation avec des transitions isolant-metal." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10087.

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L'etude des proprietes magnetiques et de transport de differentes series de solutions solides autour des alliages d'heusler tico#2sn et demi-heusler ticosn montre des caracteristiques classiques du ferromagnetisme itinerant. Dans la serie tico#2sn-tini#2sn, la densite locale est fortement reduite et le critere de stoner n'est plus maintenu pour tini#2sn. Le ferromagnetisme disparait au profit d'un etat paramagnetique de pauli. Vers la limite magnetique-non magnetique, la resistivite et la chaleur specifique montrent de fortes fluctuations de spin. Dans la serie tico#xsn avec 1
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Книги з теми "Ferromagnetic Heusler alloys"

1

Baerner, Klaus. Double exchange in Heusler alloys and related materials. Trivandrum, Kerala, India: Research Signpost, 2007.

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2

Heusler Alloys: Structure, Properties and Applications. Nova Science Publishers, Incorporated, 2018.

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Частини книг з теми "Ferromagnetic Heusler alloys"

1

Yilgin, R., and B. Aktas. "Anisotropy of Ferromagnetic Heusler Alloys Thin Films." In Springer Proceedings in Physics, 37–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-69882-1_3.

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Galanakis, Iosif, and Peter H. Dederichs. "Half-Metallicity and Slater-Pauling Behavior in the Ferromagnetic Heusler Alloys." In Half-metallic Alloys, 1–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11506256_1.

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3

Herper, Heike C., Peter Kratzer, Heiko Wende, Bernhard Krumme, Kurt Westerholt, and Peter Entel. "Ferromagnetic Heusler Alloy Thin Films: Electronic Properties and Magnetic Moment Formation." In Springer Tracts in Modern Physics, 119–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-32042-2_4.

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4

Singh, Devinder, and Kuldeep Chand Verma. "Magnetic Properties of Heusler Alloys and Nanoferrites." In Magnetic Skyrmions. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95466.

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In this chapter, results of our recent investigations on the structural, microstructural and magnetic properties of Cu-based Heusler alloys and MFe2O4 (M = Mn, Fe, Co, Ni, Cu, Zn) nanostructures will be discussed. The chapter is divided into two parts, the first part describes growth and different characterizations of Heusler alloys while in the second part magnetic properties of nano-ferrites are discussed. The Cu50Mn25Al25-xGax (x = 0, 2, 4, 8 and 10 at %) alloys have been synthesized in the form of ribbons. The alloys with x ≤ 8 show the formation of Heusler single phase of the Cu2MnAl structure. Further increase of Ga content gives rise to the formation of γ-Cu9Al4 type phase together with Cu2MnAl Heusler phase. The alloys are ferromagnetically ordered and the saturation magnetization (Ms) decreases slightly with increasing Ga concentration. Annealing of the ribbons significantly changes the magnetic properties of Cu50Mn25Al25-xGax alloys. The splitting in the zero field cooled (ZFC) and field cooled (FC) magnetization curves at low temperature has been observed for alloys. Another important class of material is Nanoferrites. The structural and magnetization behaviour of spinel MFe2O4 nanoferrites are quite different from that of bulk ferrites. X-ray diffraction study revealed spinel structure of MFe2O4 nanoparticles. The observed ferromagnetic behaviour of MFe2O4 depends on the nanostructural shape as well as ferrite inversion degree. The magnetic interactions in Ce doped CoFe2O4 are antiferromagnetic that was confirmed by zero field/field cooling measurements at 100 Oe. Log R (Ω) response measurement of MgFe2O4 thin film was taken for 10–90% relative humidity (% RH) change at 300 K.
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Sakon, T., H. Nagashio, K. Sasaki, S. Susuga, D. Numakura, M. Abe, K. Endo, S. Yamashita, H. Nojiri, and T. Kanomat. "Thermal Strain and Magnetization Studies of the Ferromagnetic Heusler Shape Memory Alloys Ni2MnGa and the Effect of Selective Substitution in 3d Elements on the Structural and Magnetic Phase." In Shape Memory Alloys - Processing, Characterization and Applications. InTech, 2013. http://dx.doi.org/10.5772/47808.

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Uthiran, Devarajan, and Arumugam Sonachalam. "Tunable Multifuctionality in Heusler Alloys by Extreme Conditions." In Recent Advances in Perovskite Materials [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.104960.

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The multifunctional materials have demonstrated various properties such as shape memory effect (SME), magneto caloric effect (MCE), magneto resistance (MR), piezoresistance (PR), exchange bias (EB), half metallic ferromagnetism (HMF), and spin polarization. Among many Heusler compounds, Ni-Mn-Ga alloys provide SME, MCE, PR, and MR behaviors. These properties can be tuned by some external/internal perturbations such as pressure, magnetic field, and chemical composition. These alloys are prepared using an arc melting furnace under by melting the high-purity starting elements (99.99%). The aim of the book chapter is to enhance the multicaloric properties (MCE and PR) nearer to ambient temperature by the application of some external parameters. Hence, we have chosen few Heusler alloys. These materials are investigated under extreme conditions (hydrostatic pressure, high magnetic field, and low temperature). All the doped and undoped Ni-Mn-Ga alloy series alloys exhibit conventional MCE. The application of external magnetic field increases the magnetization for both alloys. The hydrostatic pressure influences Ms and broadens the hysteresis width in both the samples. The observed metamagnetic transition at ambient pressure gets suppressed at higher pressure. Also, high pressure induces larger magneto crystalline anisotropy. The effect of pressure on MCE is decreased for both Ni2–xMn1+xGa (x = 0 and 0.15) alloys. These alloys exhibit –ve PR (x=0 @ 30 kbar) and +ve PR (x = 0.15@ 28 kbar) when subjected to hydrostatic pressure. The rate of change of T and resistivity with respect to pressure are calculated and show positive values for both the samples. The residual resistivity and electron-electron scattering factor are found to be decreased with pressure for x = 0, and it exhibits metallic behavior. However, both parameters increase for x = 0.15 alloy, and it may be related to static disorder effects and spin fluctuations.
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Тези доповідей конференцій з теми "Ferromagnetic Heusler alloys"

1

Halder, Madhumita, and S. M. Yusuf. "Crossover from antiferromagnetic to ferromagnetic state in the semi heusler alloys Cu1-xNixMnSb." In SOLID STATE PHYSICS: Proceedings of the 56th DAE Solid State Physics Symposium 2011. AIP, 2012. http://dx.doi.org/10.1063/1.4710430.

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2

Autric, Michel L., Eric Valerio, Philippe Caminat, Cristiana E. A. Grigorescu, Odile Monnereau, William Branford, and Lesley Cohen. "Single- and double-beam pulsed laser deposition of ferromagnetic half-Heusler NiMnSb and MnSb/NiMnSb alloys: applications to spintronics." In High-Power Laser Ablation 2004, edited by Claude R. Phipps. SPIE, 2004. http://dx.doi.org/10.1117/12.547119.

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3

Faidley, LeAnn E., Marcelo J. Dapino, Gregory N. Washington, and Thomas A. Lograsso. "Dynamic Response in the Low-kHz Range and Delta-E Effect in Ferromagnetic Shape Memory Ni-Mn-Ga." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43198.

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Recent work on ferromagnetic shape memory nickel-manganese-gallium (Ni-Mn-Ga) has demonstrated several characteristics which make this material attractive as an active element for the next generation of intelligent transducers. Alloys of martensitic Ni-Mn-Ga can strain up to 6% as a result of the rotation of twin variants and associated twin boundary motion which occur in these materials in response to magnetic fields. The magnetic actuation holds promise in transducer design because it can lead to enhanced frequency response compared with shape memory alloys with comparable strains. In this paper, we report on experimental measurements collected from a Ni50Mn28.7Ga21.3 sample which has been tested in a solenoid transducer by means of a novel drive configuration consisting of a collinear uniaxial field-uniaxial stress pair. We have observed that the elastic modulus of a Ni-Mn-Ga sample driven in these conditions changes substantially in response to varying bias field. In this paper, we further investigate the dependence of the elastic modulus on ac field intensity and mechanical load as well as bias field. Quasistatic, white noise, and swept-sine excitations were employed to examine the behavior of Ni50Mn28.7Ga21.3 driven under various combinations of magnetic fields and mechanical loads. Mechanically free quasi-static tests demonstrate reversible strains of 6300 με which are consistent with prior measurements on samples with similar composition near the Heusler stoichiometry. Dynamic measurements reveal a significant stiffness increase, of up to 209%, with dc bias field. This frequency shift or ΔE effect is shown to originate in the Ni-Mn-Ga sample and is believed to stem from the reorientation of twin variants in response to varying dc field. These results might facilitate a new class of solenoid-based Ni-Mn-Ga transducers for tunable vibration absorber applications, and lay the ground work for developing methods and criteria for the implementation of broadband Ni-Mn-Ga transducer technologies.
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4

Matsuda, Kazuhisa, Masahiko Hiroi, and Masayuki Kawakami. "Ferromagnetism in the Heusler alloys Ru2−xFexCrSi." In LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24. AIP, 2006. http://dx.doi.org/10.1063/1.2355158.

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Seh, Ab Quyoom, S. Yousuf, T. M. Bhat, S. Singh, S. A. Mir, S. A. Sofi, S. A. Khandy, et al. "Quaternary Heusler alloy CoNbMnGa as ferromagnetic semiconductor." In DAE SOLID STATE PHYSICS SYMPOSIUM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0021305.

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Pacewicz, Adam, Bartlomiej Salski, Pawel Kopyt, Oleksandr Chumak, Adam Nabialek, and Jerzy Krupka. "Ferromagnetic linewidth measurements of CFMS Heusler alloy films." In 2018 22nd International Microwave and Radar Conference (MIKON). IEEE, 2018. http://dx.doi.org/10.23919/mikon.2018.8405278.

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Datta, Subhadeep, Shampa Guha, Jyotirekha Mallick, Murli Kumar Manglam, and Manoranjan Kar. "Enhanced saturation magnetization of Co2TiAl0.75Si0.25 ferromagnetic Heusler alloy." In 3RD INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC-2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0001218.

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Rani, Deepika, K. G. Suresh, and Aftab Alam. "Half-metallic ferromagnetism in equiatomic quaternary Heusler alloy CoRuMnSb." In DAE SOLID STATE PHYSICS SYMPOSIUM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0016675.

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Wang, H., Y. Wu, Y. Jiang, and J. Zhao. "Electrical control of ferromagnetism in Heusler alloy Co2FeAl0.5Si0.5 at room temperature." In 2015 IEEE International Magnetics Conference (INTERMAG). IEEE, 2015. http://dx.doi.org/10.1109/intmag.2015.7156735.

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Nagpal, Anushka, Bhuvan Agrawal, Ramesh Kumar, Hardev S. Saini, Manish K. Kashyap, and Mukhtiyar Singh. "Effect of disorders on half-metallic ferromagnetism in Cr2CoAl inverse Heusler alloy." In PROCEEDINGS OF THE NATIONAL CONFERENCE ON RECENT ADVANCES IN CONDENSED MATTER PHYSICS: RACMP-2018. Author(s), 2019. http://dx.doi.org/10.1063/1.5097092.

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