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Journal articles on the topic 'Magnetic pressure'

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Published: 1 June 2024

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1

Kuchin, Anatoly, Zdenek Arnold, Jiri Kamarád, and Sergey Platonov. "Magnetic properties of Tm2Fe16 under pressure." EPJ Web of Conferences 185 (2018): 04018. http://dx.doi.org/10.1051/epjconf/201818504018.

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The magnetic properties of the non-stoichiometric Tm2Fe16 compound under hydrostatic pressures up to 1 GPa were studied. We have revealed that the high-temperature ferrimagnetic state easily magnetized in the basal plane is very sensitive to the volume changes and even moderate pressure is sufficient to its complete suppression and transformation to a helimagnetic state. At the same time, the low-temperature ferrimagnetic state easily magnetized along the hexagonal axis does not disappear under pressure and the temperature of its transition to the high-temperature magnetic states increases under pressure. The remarkable stability of the ground ferrimagnetic state under external pressure can be attributed to the strengthening of the uniaxial magnetic anisotropy and to the mutual perpendicular orientation of the magnetic moments in the ground and the high-temperature magnetic states.

2

Bacri, J. C., J. Lenglet, R. Perzynski, and J. Servais. "Magnetic fluid pressure sensor." Journal of Magnetism and Magnetic Materials 122, no. 1-3 (April 1993): 399–402. http://dx.doi.org/10.1016/0304-8853(93)91118-q.

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3

Fisher, Shaun, and George Pickett. "Up the magnetic pressure." Nature 444, no. 7121 (December 2006): 832–33. http://dx.doi.org/10.1038/444832a.

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4

Cornelius, Andrew L., Brant Abeln, Daniel Antonio, Jason Baker, Patricia E. Kalita, and Ravhi S. Kumar. "High Pressure Materials Physics Research at UNLV." Materials Science Forum 783-786 (May 2014): 1836–38. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.1836.

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High-pressure studies on strongly correlated-electron systems allow the study of the relationship between structural, elastic, electronic, and magnetic properties of d-and f-band systems. The High Pressure Science and Engineering Center (HiPSEC) at UNLV performs interdisciplinary research on a wide variety of materials at high pressures. One such system, YbB2 displays antiferromagnet order at ambient pressure. We present heat capacity measurements at high magnetic fields to 9 T and structural measurement at pressures up to 5 GPa on YbB2.

5

BÄRNER, K., J. W. SCHÜNEMANN, K. HEINEMANN, A. A. GANIN, Yu S. BERSENEV, and I. V. MEDVEDEVA. "CORRELATION OF TRANSPORT AND TOPOLOGICAL/SPIN DISORDER FOR SOME AMORPHOUS METALLIC AND MAGNETIC ALLOYS." International Journal of Modern Physics B 07, no. 01n03 (January 1993): 968–71. http://dx.doi.org/10.1142/s0217979293002109.

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The resistivity ρ and the permeability μ of amorphous magnetic ribbons (Fe100−xMnx)75P15C10 are determined at ambient pressure and pressures up to 15 kbar and correlated with the topological and magnetic disorder. The characterization includes the Curie temperature Tc, its pressure derivative ∂Tc/∂p and the pressure dependence of the resistivity minimum temperature.

6

Tseneklidou, Dimitra, Christos G. Tsagas, and John D. Barrow. "Relativistic magnetised perturbations: magnetic pressure versus magnetic tension." Classical and Quantum Gravity 35, no. 12 (May 16, 2018): 124001. http://dx.doi.org/10.1088/1361-6382/aac07f.

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7

Begunovich, Lyudmila V., Maxim M. Korshunov, and Sergey G. Ovchinnikov. "Magnetic Collapse in Fe3Se4 under High Pressure." Materials 15, no. 13 (June 29, 2022): 4583. http://dx.doi.org/10.3390/ma15134583.

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Electronic structure and magnetic properties of Fe3Se4 are calculated using the density functional approach. Due to the metallic properties, magnetic moments of the iron atoms in two nonequivalent positions in the unit cell are different from ionic values for Fe3+ and Fe2+ and are equal to M1=2.071μB and M2=−2.042μB, making the system ferrimagnetic. The total magnetic moment for the unit cell is 2.135μB. Under isotropic compression, the total magnetic moment decreases non-monotonically and correlates with the non-monotonic dependence of the density of states at the Fermi level N(EF). For 7% compression, the magnetic order changes from the ferrimagnetic to the ferromagnetic. At 14% compression, the magnetic order disappears and the total magnetic moment becomes zero, leaving the system in a paramagnetic state. This compression corresponds to the pressure of 114 GPa. The magnetic ordering changes faster upon application of an isotropic external pressure due to the sizeable anisotropy of the chemical bondings in Fe3Se4. The ferrimagnetic and paramagnetic states occur under pressures of 5.0 and 8.0 GPa, respectively. The system remains in the metallic state for all values of compression.

8

Sokolovskiy, V. V., M. A. Zagrebin, and V. D. Buchelnikov. "Magnetocaloric Effect of Mn<sub>2</sub>YSn (Y = Sc, Ti, V) Alloys." Физика металлов и металловедение 124, no. 11 (November 1, 2023): 1122–28. http://dx.doi.org/10.31857/s0015323023601265.

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Abstract—In this paper, the structural, magnetic, and thermodynamic properties of Mn2YSn (Y = Sc, Ti, and V) alloys are considered depending on the applied pressure using the density functional theory and the Monte Carlo method. It is shown that for each compound there are two magnetic states with a low and a high magnetic moment at a smaller and larger unit cell volume, separated by an energy barrier. The barrier value depends on the applied external pressure. The two phases become almost equal in energy at critical pressures of 3.4, –2.9, and –3.25 GPa for Mn2ScSn, Mn2TiSn, and Mn2VSn, respectively. The temperature behavior of the magnetization and magnetocaloric characteristics for the studied phases at various pressures is obtained. Accounting for pressure leads to an understanding of the mechanism of the increase in the magnetocaloric effect in the phase with a high magnetic moment. The greatest effect (ΔSmag ≈ 0.158 J/mol K and ΔTad ≈ 1.1 K) is predicted for Mn2TiSn at a pressure of –2.9 GPa and a change in the magnetic field from 0 to 2 T.

9

KOMIYA, Kinichi, Ikuo ITOH, and Katsunori MITSUNAGA. "Pressure Sensing Using Magnetic Fluid." Transactions of the Society of Instrument and Control Engineers 26, no. 7 (1990): 833–35. http://dx.doi.org/10.9746/sicetr1965.26.833.

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10

Gassmann, Stefan, and Lienhard Pagel. "Magnetic actuated pressure relief valve." Sensors and Actuators A: Physical 194 (May 2013): 106–11. http://dx.doi.org/10.1016/j.sna.2012.12.033.

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11

Mito, Takeshi, Masanori Nakamura, Manabu Otani, Shinji Wada, Takehide Koyama, Mamoru Ishizuka, and John L. Sarrao. "Pressure induced magnetic ordering in." Journal of Magnetism and Magnetic Materials 310, no. 2 (March 2007): 352–53. http://dx.doi.org/10.1016/j.jmmm.2006.10.066.

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12

Ishizuka, M., and K. Amaya. "Magnetic measurements under ultrahigh pressure." IEEE Transactions on Magnetics 30, no. 2 (March 1994): 1048–51. http://dx.doi.org/10.1109/20.312486.

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13

PÉREZ ROJAS, H., and E. RODRÍGUEZ QUERTS. "NEGATIVE PRESSURES IN QED VACUUM IN AN EXTERNAL MAGNETIC FIELD." International Journal of Modern Physics A 21, no. 18 (July 20, 2006): 3761–70. http://dx.doi.org/10.1142/s0217751x06031715.

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Our aim is to study the electron–positron vacuum pressures in the presence of a strong magnetic field B. To that end, we obtain a general energy–momentum tensor, depending on external parameters, which in the zero temperature and zero density limit leads to vacuum expressions which are approximation-independent. Anisotropic pressures arise, and in the tree approximation of the magnetic field case, the pressure along B is positive, whereas perpendicular to B it is negative. Due to the common axial symmetry, the formal analogy with the Casimir effect is discussed, which in addition to the usual negative pressure perpendicular to the plates, there is a positive pressure along the plates. The formal correspondence between the Casimir and blackbody energy–momentum tensors is also discussed. The fermion hot vacuum behavior in a magnetic field is also briefly discussed.

14

Simeunovic, R., A. Maricic, A. Kalezic-Glisovic, and M. Spasojevic. "The effect of pressing pressure on the magnetic properties of amorphous Co80Ni20 alloy powder." Science of Sintering 38, no. 3 (2006): 283–86. http://dx.doi.org/10.2298/sos0603283s.

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The impact of amorphous Co80Ni20 alloy powder pressing pressure on magnetic properties was investigated. The powder was pressed at room temperature under pressures of 560 MPa, 1100 MPa and 1300 MPa. Investigation of magnetic properties was conducted by magnetic susceptibility measurement in temperature range from 290 K to 900 K. It has been determined that with a pressing pressure increase the magnetic susceptibility rises. The differential scanning calorimetry method showed that the crystallization process occurred in two stages and each crystallization stage was followed by a magnetic susceptibility change.

15

Szczęch, Marcin. "Magnetic fluid seal critical pressure calculation based on numerical simulations." SIMULATION 96, no. 4 (October 30, 2019): 403–13. http://dx.doi.org/10.1177/0037549719885168.

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Magnetic fluid seals are among the most common ferrofluid applications. One interesting area is the use of numerical simulations to determine the critical pressure, which is a basic parameter determining the possible range of seal operating pressures. The purpose of this study is to present the method of critical pressure calculations in magnetic fluid seals based on magnetic field numerical simulations, which will provide better results than the methods used previously. It is a relatively simple method and can help to reduce the difference between simulations and experiments. Different seal stage shapes, such as symmetric trapezoidal, asymmetric trapezoidal, and rectangular, were taken into account. The research shows that an increase in the magnetic fluid volume applied at the seal stage and a magnetic saturation increase in the seal gap allow the manufacturing inaccuracy influence to be reduced, meaning that the difference between the simulation and experiment results is smaller. In addition, in this paper, the pressure transfer mechanism between liquid rings of the multistage seal is analyzed to show its influence on the critical pressure value calculated based on simulations.

16

Ferrer, Efrain J., and Aric Hackebill. "Equation of State of a Magnetized Dense Neutron System." Universe 5, no. 5 (May 6, 2019): 104. http://dx.doi.org/10.3390/universe5050104.

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We discuss how a magnetic field can affect the equation of state of a many-particle neutron system. We show that, due to the anisotropy in the pressures, the pressure transverse to the magnetic field direction increases with the magnetic field, while the one along the field direction decreases. We also show that in this medium there exists a significant negative field-dependent contribution associated with the vacuum pressure. This negative pressure demands a neutron density sufficiently high (corresponding to a baryonic chemical potential of μ = 2.25 GeV) to produce the necessary positive matter pressure that can compensate for the gravitational pull. The decrease of the parallel pressure with the field limits the maximum magnetic field to a value of the order of 10 18 G, where the pressure decays to zero. We show that the combination of all these effects produces an insignificant variation of the system equation of state. We also found that this neutron system exhibits paramagnetic behavior expressed by the Curie’s law in the high-temperature regime. The reported results may be of interest for the astrophysics of compact objects such as magnetars, which are endowed with substantial magnetic fields.

17

Oomi, G., N. Matsuda, T. Kagayama, C. K. Cho, and P. C. Canfield. "Electronic Properties of Magnetic Superconductor HoNi2B2C Under High Pressure." International Journal of Modern Physics B 17, no. 18n20 (August 10, 2003): 3664–71. http://dx.doi.org/10.1142/s0217979203021587.

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The electrical resistivity of single crystalline HoNi 2 B 2 C has been measured at high pressure and magnetic fields. The three anomalies in the magnetoresistance due to metamagnetic transitions are observed both at ambient and high pressures. It is found that the metamagnetic transition fields increase with increasing pressure. The temperature dependence of electrical resistivity is strongly dependent on magnetic field. Non Fermi liquid behavior is observed near the metamagnetic transition fields. But the normal Fermi liquid behavior recovers after completing the phase transition. The Grüneisen parameters are also calculated to examine the stability of electronic state.

18

Yang, Xiaolong, Yunyun Song, Peng Sun, and You Li. "Design and Experimental Study on Divergent Magnetic Fluid Seal with Large Clearance and Dual Magnetic Sources." Advances in Materials Science and Engineering 2022 (January 30, 2022): 1–11. http://dx.doi.org/10.1155/2022/4637689.

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In order to solve the leakage problem of rotating machinery under the condition of large clearance, a new type of divergent magnetic fluid sealing device with secondary magnetic source was designed. The magnetic field distribution in the clearance of the magnetic fluid seal was simulated by the finite element method of magnetic field, and the theoretical value of the sealing pressure resistance was calculated according to the pressure resistance theory of the divergent magnetic fluid seal. The influences of the volume of magnetic fluid injection, the number of teeth, the clearance, and the eccentricity of the rotating shaft on the pressure resistance abilities of divergent magnetic fluid seal were studied by experimental method and compared with the pressure resistance experimental value of ordinary magnetic fluid seal. The results showed that when the injection volume of magnetic fluid is more than 3 ml, the sealing pressure resistance ability of the magnetic fluid does increase greatly and tends to be stable gradually. The saturated magnetic fluid injection volume of divergent magnetic fluid seal with large clearance is 3 ml. With the increase of radial teeth, the pressure resistance ability of magnetic fluid seal first increases and then decreases. With the increase of axial teeth, the pressure resistance ability of magnetic fluid seal also increases. With the increase of radial clearance, the pressure resistance value of magnetic fluid seal first increases and then decreases. With the increase of axial clearance, the pressure resistance value of magnetic fluid seal decreases. The pressure resistance ability of divergent magnetic fluid seal is significantly higher than that of ordinary magnetic fluid seal.

19

SHARMA, P. K., and R. K. CHHAJLANI. "Kelvin–Helmholtz instability of a plasma with anisotropic and polytropic pressure laws." Journal of Plasma Physics 60, no. 2 (September 1998): 229–41. http://dx.doi.org/10.1017/s0022377898006825.

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The Kelvin–Helmholtz (K–H) instability of two fluids of plasma streaming in opposite directions with the same velocity and in the presence of an external magnetic field is investigated. The usual magnetohydrodynamic equations with anisotropic pressure are considered. In the present problem, the two pressures parallel and perpendicular to the direction of the magnetic field are defined by polytropic pressure laws. The generalized pressure relations are used, and two equations of state for two pressures are assumed. The equations are linearized, and initially two different flow velocities are taken for the system. The flow is assumed to be in the direction perpendicular to the magnetic field. The problem is solved and a dispersion relation is obtained. From the dispersion relation, the K–H instability condition is obtained. It is found that the instability condition depends upon the polytropic indices of the pressure relations. The condition of instability is further obtained for MHD and Chew–Goldberger–Low systems. It is also found that the growth rate of the instability depends upon various polytropic indices.

20

Kobayashi, H., and J. Umemura. "Magnetic Compton scattering under high pressure." Acta Crystallographica Section A Foundations of Crystallography 64, a1 (August 23, 2008): C139. http://dx.doi.org/10.1107/s0108767308095524.

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21

Arnold, Z., O. Isnard, H. Mayot, Y. Skorokhod, and J. Kamarád. "Pressure effect on magnetic properties of." Solid State Communications 150, no. 35-36 (September 2010): 1614–16. http://dx.doi.org/10.1016/j.ssc.2010.06.043.

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22

Ebihara, Takao, Tetsuro Takahashi, Koji Tezuka, Masato Hedo, Yoshiya Uwatoko, and Shinya Uji. "Magnetic field and pressure effects in." Physica B: Condensed Matter 359-361 (April 2005): 272–74. http://dx.doi.org/10.1016/j.physb.2005.01.074.

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23

Fuchizaki, Yoshinobu, Gendo Oomi, and Masayuki Kawakami. "Pressure-induced magnetic instability in alloys." Physica B: Condensed Matter 378-380 (May 2006): 125–26. http://dx.doi.org/10.1016/j.physb.2006.01.049.

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24

Prokeš, K., T. Fujita, N. V. Mushnikov, S. Hane, T. Tomita, T. Goto, V. Sechovsky, A. V. Andreev, and A. A. Menovsky. "Magnetic properties of UNiAl under pressure." Physical Review B 59, no. 13 (April 1, 1999): 8720–24. http://dx.doi.org/10.1103/physrevb.59.8720.

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25

Kakurai, K., T. Osakabe, K. Goto, A. Oosawa, M. Fujisawa, and H. Tanaka. "Pressure-induced magnetic ordering in KCuCl3." Physica B: Condensed Matter 385-386 (November 2006): 450–52. http://dx.doi.org/10.1016/j.physb.2006.05.237.

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26

Cornelius, A. L., R. S. Kumar, M. K. Jacobsen, E. D. Bauer, J. S. Sarrao, and Z. Fisk. "Magnetic ordering in at high pressure." Physica B: Condensed Matter 403, no. 5-9 (April 2008): 940–42. http://dx.doi.org/10.1016/j.physb.2007.10.279.

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27

Naka, T., T. Matsumoto, N. Môri, Y. Okayama, Y. Haga, and T. Suzuki. "Pressure-induced magnetic transition in CeP." Physica B: Condensed Matter 239, no. 3-4 (August 1997): 245–51. http://dx.doi.org/10.1016/s0921-4526(97)00356-6.

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28

Fujii, N., R. Zach, M. Ishizuka, F. Ono, T. Kanomata, and S. Endo. "Pressure-induced magnetic transition in MnRhAs." Journal of Magnetism and Magnetic Materials 224, no. 1 (February 2001): 12–16. http://dx.doi.org/10.1016/s0304-8853(00)01361-5.

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29

Mirebeau, Isabelle. "Magnetic neutron diffraction under high pressure." Comptes Rendus Physique 8, no. 7-8 (September 2007): 737–44. http://dx.doi.org/10.1016/j.crhy.2007.09.020.

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30

Honda, F., K. Prokeš, G. Oomi, T. Kagayama, A. V. Andreev, V. Sechovský, L. Havela, and E. Brück. "Magnetic Phases in UNiGa under Pressure." REVIEW OF HIGH PRESSURE SCIENCE AND TECHNOLOGY 7 (1998): 662–64. http://dx.doi.org/10.4131/jshpreview.7.662.

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31

Liu, Wan-Li, Masafumi Yamashita, Makio Kurisu, Hideoki Kadomatsu, and Hiroshi Fujiwara. "Magnetic Transitions of Gd2In under Pressure." Journal of the Physical Society of Japan 56, no. 1 (January 15, 1987): 421–22. http://dx.doi.org/10.1143/jpsj.56.421.

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32

Takigawa, M., E. T. Ahrens, and Y. Ueda. "Anomalous Magnetic Properties of MetallicV2O3under Pressure." Physical Review Letters 76, no. 2 (January 8, 1996): 283–86. http://dx.doi.org/10.1103/physrevlett.76.283.

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33

AIZAWA, Tomokatsu. "Magnetic Pressure Welding of Copper Foils." Proceedings of the Materials and processing conference 2003.11 (2003): 325–26. http://dx.doi.org/10.1299/jsmemp.2003.11.325.

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34

Inuzuka, Sayuri. "Oriented Magnetic Fields and Blood Pressure." International Journal of Cardiovascular Sciences 35, no. 6 (2022): 706–7. http://dx.doi.org/10.36660/ijcs.20220167.

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35

Sechovsk�, V., K. Proke?, F. Honda, B. Ouladdiaf, and J. Kulda. "Pressure-induced magnetic structures in UNiGa." Applied Physics A: Materials Science & Processing 74 (December 1, 2002): s834—s836. http://dx.doi.org/10.1007/s003390201580.

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36

Duraj, M., and A. Szytuła. "Non-collinear magnetic structures under pressure." physica status solidi (b) 236, no. 2 (March 2003): 470–73. http://dx.doi.org/10.1002/pssb.200301706.

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37

Rodríguez-Velamazán, J. Alberto, Oscar Fabelo, Christine M. Beavers, Eva Natividad, Marco Evangelisti, and Olivier Roubeau. "A Multifunctional Magnetic Material under Pressure." Chemistry - A European Journal 20, no. 26 (May 7, 2014): 7956–61. http://dx.doi.org/10.1002/chem.201402046.

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38

Murphy, Eric J. "The Relative Importance of Thermal Gas, Radiation, and Magnetic Pressures around Star-forming Regions in Normal Galaxies and Dusty Starbursts." Astrophysical Journal 938, no. 2 (October 1, 2022): 135. http://dx.doi.org/10.3847/1538-4357/ac8661.

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Abstract In this paper, an investigation on the relative importance of the thermal gas, radiation, and (minimum-energy) magnetic pressures around ≈200 star-forming regions in a sample of nearby normal and luminous infrared galaxies is presented. Given the range of galaxy distances, pressure estimates are made on spatial scales spanning ∼0.1–3 kpc. The ratio of thermal gas-to-radiation pressures does not appear to significantly depend on star formation rate surface density (ΣSFR), but exhibits a steady decrease with increasing physical size of the aperture over which the quantities are measured. The ratio of magnetic-to-radiation pressures appears to be relatively flat as a function of ΣSFR and similar in value for both nuclear and extranuclear regions, but, unlike the ratio of thermal gas-to-radiation pressures, exhibits a steady increase with increasing aperture size. Furthermore, it seems that the magnetic pressure is typically weaker than the radiation pressure on subkiloparsec scales, and only starts to play a significant role on few-kiloparsec scales. When the internal pressure terms are summed, their ratio to the (ΣSFR-inferred) kiloparsec-scale dynamical equilibrium pressure estimates is roughly constant. Consequently, it appears that the physical area of the galaxy disk, and not necessarily environment (e.g., nuclear versus extranuclear regions) or star formation activity, may play the dominant role in determining which pressure term is most active around star-forming regions. These results are consistent with a scenario in which a combination of processes acting primarily on different physical scales work collectively to regulate the star formation process in galaxy disks.

39

Shafik, A. "Sacral magnetic stimulation in puborectalis paradoxical syndrome." Acta chirurgica Iugoslavica 49, no. 2 (2002): 27–32. http://dx.doi.org/10.2298/aci0202027s.

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Background and Purpose: Our earlier studies have demonstrated that sacral magnetic stimulation (IMS) in the canine model, in healthy volunteers and in constipated subjects effected rectal pressure rise, decline of the rectal neck (anal canal) pressure as well as rectal evacuation. Based on these results, we studied the effect of sacral MS on defecation in patients with puborectalis paradoxical syndrome (PPS). Methods: Eleven subjects (8 women, 3 men; age 36-53 years) with PPS were enrolled in the study. The magnetic coil was placed on the back with its center located between L4 and L5. Stimulation parameters were set at 70% of maximum intensity, 40 Hz frequency and 2-second burst length with 2 seconds off. During MS, the rectal neck and gastric (intra-abdominal) pressures were measured. The procedure was performed in the empty and in the full rectum using the balloon expulsion test in the latter. Results: MS of the empty and balloon-filled rectum effected rise of the rectal pressure (p<0.001), decline of the rectal neck pressure (p>0.001) and no significant change of the intragastric pressure (p>0.05). The balloon was expelled to the exterior in all the patients. Conclusions: Sacral MS succeeded in dispelling to the exterior the water-filled rectal balloon. The method is simple, easy, non-invasive, non-radiologic and can be performed on an outpatient basis for the treatment of PPS.

40

Ding, Chao, Yunhui Mei, Khai D. T. Ngo, and Guoquan Lu. "A (Permalloy + NiZn Ferrite) Moldable Magnetic Composite for Heterogeneous Integration of Power Electronics." Materials 12, no. 12 (June 22, 2019): 1999. http://dx.doi.org/10.3390/ma12121999.

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Soft magnetic moldable composites (SM2Cs) would be ideally suited for the integration of magnetic components in power electronic converters because they can be formed into magnetic cores by low-temperature and pressure-less processing. However, most SM2Cs have low relative magnetic permeability, typically less than 30, and high core-loss densities at switching frequencies over 1 MHz. To improve their magnetic properties, we combine powders of Permalloy and a NiZn ferrite with an acrylic polymer to formulate a paste of SM2C. The paste can be molded and then cured below 200 °C without pressure to form cores with a relative permeability over 35 and a core-loss density at 1 MHz, 30% lower than those of commercial cores. The ease of its processing and high-performance properties makes the SM2C a good candidate material for the integration of power magnetics.

41

Saito, Tetsuji, Tomonari Takeuchi, and Hiroyuki Kageyama. "Structures and magnetic properties of Nd–Fe–B bulk nanocomposite magnets produced by the spark plasma sintering method." Journal of Materials Research 19, no. 9 (September 2004): 2730–37. http://dx.doi.org/10.1557/jmr.2004.0358.

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We studied the effects of the sintering temperature and applied pressure on Nd–Fe–B bulk nanocomposite magnets produced by the spark plasma sintering (SPS) method. Amorphous Nd4Fe77.5B18.5 melt-spun ribbons were successfully consolidated into bulk form by the SPS method. When sintered at 873 K under applied pressures between 30 and 70 MPa, the bulk materials consisted of nanocomposite materials with a soft magnetic Fe3B phase and hard magnetic Nd2Fe14B phase. The density and magnetic properties of the bulk materials sintered at 873 K were strongly dependent on the applied pressure during sintering. Bulk Nd4Fe77.5B18.5 nanocomposite magnets sintered at 873 K under an applied pressure of 70 MPa showed a high remanence of 9.3 kG with a high coercivity of 2.5 kOe.

42

SASTRI, N. S., and A. K. PHANSE. "Severe magnetic storms and surface pressure variations." MAUSAM 23, no. 1 (January 27, 2022): 91–92. http://dx.doi.org/10.54302/mausam.v23i1.5133.

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Association of surface pressure variation with magnetic activity is studied, using the superposed epoch method. A steady fall in pressure upto about 4 days prior to the day of onset of severe magnetic storm is noticed.

43

FISHER, R. A., R. BALLOU, J. P. EMERSON, E. LELIEVRE-BERNA, and N. E. PHILLIPS. "LOW-TEMPERATURE SPECIFIC HEAT OF YMn2 IN THE PARAMAGNETIC AND ANTIFERROMAGNETIC PHASES." International Journal of Modern Physics B 07, no. 01n03 (January 1993): 830–33. http://dx.doi.org/10.1142/s0217979293001761.

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The low-temperature specific heat of YMn2 has been measured at applied pressures of 0 to 7.7 kbar. A paramagnetic state is stabilized for moderate values of the applied pressure (of the order of 1.6 kbar). A large linear term in the specific heat, which decreases regularly with increasing pressure, is observed in this phase. It is ascribed to giant spin fluctuations associated with a magnetic-non magnetic instability and a strong geometrical spin frustration.

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Grechnev, G. E., A. A. Lyogenkaya, V. A. Desnenko, A. V. Fedorchenko, and A. S. Panfilov. "Magnetic and magnetoelastic properties of antiferromagnet FeGe2." Low Temperature Physics 49, no. 9 (September 1, 2023): 1025–30. http://dx.doi.org/10.1063/10.0020594.

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The magnetic susceptibility χ of single-crystal antiferromagnet FeGe2 (TN = 289 K) was measured in the temperature range from 4.2 to 300 K in a magnetic field H up to 40 kOe applied along the main crystallographic axes. For the antiferromagnetic (AFM) state at low temperatures, a strong increase in χ is observed with increasing H applied along the [100] axis, which reaches saturation at H≥H0∼ 11 kOe. It is assumed that this behavior is associated with a field-induced change in the AFM domain structure, and the single-domain state is realized in a field above H0 with the AFM axis perpendicular to the field direction. The study of χ under the uniaxial Pa and uniform P pressures in a wide temperature range has revealed an anomalously large increase in χ in AFM state with increasing uniaxial pressure for Pa||H||[100] at H≪H0. The observed growth of χ saturates at pressure Pa≥Pa∗≃1.5 kbar and suggests the formation of the single-domain state for the above conditions. The values of uniform pressure effect on χ was found to lie in the range dln⁡χ/dP = − (2–3) Mbar–1, being weakly dependent on the magnetic state and field direction. In addition, the uniform pressure effect on the transition temperature between two AFM structures in FeGe2, TM≃263 K, was found to be weak.

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Wang, Yishu, T. F. Rosenbaum, and Yejun Feng. "X-ray magnetic diffraction under high pressure." IUCrJ 6, no. 4 (June 21, 2019): 507–20. http://dx.doi.org/10.1107/s2052252519007061.

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Advances in both non-resonant and resonant X-ray magnetic diffraction since the 1980s have provided researchers with a powerful tool for exploring the spin, orbital and ion degrees of freedom in magnetic solids, as well as parsing their interplay. Here, we discuss key issues for performing X-ray magnetic diffraction on single-crystal samples under high pressure (above 40 GPa) and at cryogenic temperatures (4 K). We present case studies of both non-resonant and resonant X-ray magnetic diffraction under pressure for a spin-flip transition in an incommensurate spin-density-wave material and a continuous quantum phase transition of a commensurate all-in–all-out antiferromagnet. Both cases use diamond-anvil-cell technologies at third-generation synchrotron radiation sources. In addition to the exploration of the athermal emergence and evolution of antiferromagnetism discussed here, these techniques can be applied to the study of the pressure evolution of weak charge order such as charge-density waves, antiferro-type orbital order, the charge anisotropic tensor susceptibility and charge superlattices associated with either primary spin order or softened phonons.

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Masa'id, Aji, Ubaidillah Ubaidillah, Bhre Wangsa Lenggana, Nurul Muhayat, Wibowo Wibowo, and Saiful Amri Mazlan. "An Innovative Design of Magnetorheological Lateral Damper for Secondary Suspension of a Train." International Journal of Sustainable Transportation Technology 2, no. 2 (October 31, 2019): 47–53. http://dx.doi.org/10.31427/ijstt.2019.2.2.2.

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This article delivered an innovative idea of a magnetorheological (MR) damper for secondary suspension of train bogie. The valve inside MR damper adopted meandering of both fluid flow and magnetic flux for improving magnetization area. In this work, the design and working principle of the MR valve were presented including a mathematical model to predict the pressure drop. In the early stage, the finite element method magnetics software (FEMM) simulation could predict the magnetic flux density across the passages. Based on the amount of magnetic flux, the corresponding shear yield stress could be determined from its basic physical properties. The mathematical model covered pressure drop prediction for both off-state and on-state. The FEMM simulation results showed that the meandering flow and serpentine flux design could improve the effective area of magnetization. Consequently, the pressure drop of the valve could have wider ranges and achieve a high value of pressure differences. This result could be potentially improving the performance of the damping forces of the lateral damper in a bogie train.

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Widodo, Purwadi Joko, Eko Prasetya Budiana, Ubaidillah Ubaidillah, Fitrian Imaduddin, and Seung-Bok Choi. "Effect of Time and Frequency of Magnetic Field Application on MRF Pressure Performance." Micromachines 13, no. 2 (January 29, 2022): 222. http://dx.doi.org/10.3390/mi13020222.

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This research was conducted to determine the effect of the time and frequency of magnetic field application on MRF pressure performance. It was carried out by placing magnetorheological fluid (MRF) in a U-shaped, glass tube and then repeatedly applying a magnetic field to it for a certain time period with a particular frequency set by the generator frequency. The length of the application period of the magnetic field, the frequency of the application of the magnetic field, and the magnitude of changes in fluid pressure that occurred and changes in pressure in the MRF were recorded with a data logger for a specific time, which was 60 s. From the field tests that were carried out, it was found that during the application of a continuous magnetic field, there was pressure on the MRF until it reached the maximum pressure; then, there was a gradual decrease in pressure when the magnetic field was turned off, but the pressure was intense. It was shown that the pressure decreased rapidly as the magnetism disappeared, even causing the pressure to drop below the initial pressure, which, in turn, gradually rose again toward the equilibrium pressure. Meanwhile, during the repeated application of a magnetic field, it appeared that the MRF effectively produced pressure in response to the presence of a magnetic field up to a frequency of 5 Hz. The higher the applied magnetic field frequency, the smaller the pressure change that occurred. Starting at a frequency of 10 Hz, the application of a magnetic field produced more minor pressure changes, and the resulting pressure continued to decrease as the liquid level decreased toward the initial equilibrium position.

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Dick, M. J., D. Heagle, D. Veselinovic, and D. Green. "Methane Isotherms and Magnetic Resonance Imaging in Shales." E3S Web of Conferences 146 (2020): 05004. http://dx.doi.org/10.1051/e3sconf/202014605004.

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Adsorption isotherms of light hydrocarbons on reservoir rocks are key data used to quantify the total gas content in reservoirs and isotherms are now being used to improve our understanding of the processes affecting subsurface gas flow associated with gas injection from Enhanced Oil Recovery techniques. This project combined elements of the traditional pressure-volume gas adsorption isotherm technique and an NMR-based adsorption isotherm approach to determine the adsorption isotherms of light hydrocarbons on to tight rocks from oil and gas reservoirs. The new approach allows isotherms to be derived from NMR data. First, a T2 distribution of the gas is determined over a range of gas pressures. Next, the volume of pore gas is estimated using the pore volume of the rock and the Van der Waals gas equation. The adsorbed gas content is then calculated by subtracting pore gas content from the total gas content. This is repeated for a range of gas pressures to determine the adsorption isotherm. This project used the NMR method described above and measured the gas pressure decay in the NMR cell. This combined approach includes the advantages of the NMR method but it also produces a pressure-time curve that can be used to identify when equilibrium is attained in low permeability rocks and can be used to compare adsorption kinetics of different gases. The advantages of our approach are that 1) the samples remain intact and the measurements provide information on the pore size distribution; 2) analyses can be carried out at reservoir pressures; 3) isotherms can be measured for any gas containing hydrogen atoms; and 4) the results can be used to examine the processes controlling gas flow through the rock. Future work to develop this technique will improve our quantification of the amount of pore gas in the cell, which will improve our partitioning between adsorbed gas and pore gas as well as allow for an improved analysis of the pressure response of the sample after degassing.

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Hao, Ruican, Zhixin Feng, Huagang Liu, Shang Wang, Feifei Xing, and Jia Yao. "Research on Pressure Measuring Device with Magnetic Fluid." Journal of Physics: Conference Series 2160, no. 1 (January 1, 2022): 012079. http://dx.doi.org/10.1088/1742-6596/2160/1/012079.

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Abstract Magnetic fluid is a novel material which could be applied in many fields including sensors, sealings, bilmedicines, and so on. Its super magnetism and fluidity could be used in the sensor as an inducting core. Magnetic fluid and its characteristics were introduced to adapt to the application in the pressure measuring devices. A pressure measuring device with magnetic fluid was proposed and the structure was analyzed and designed according to the characteristics of magnetic fluid. The working principle of pressure measuring device with magnetic fluid was analyzed, and the structure of pressure measuring device was designed and reformed to avoid the overflow and recovery of excessive of magnetic fluid. One arm of the U tube was designed to be a large cylinder to storage large quantities of magnetic fluid. The higher the required precision is, the larger the diameter of one arm should be designed with respect to the other arm of the tube. The measuring range of designed device could also be adjusted as needed. The measuring efficiency of the device could be improved by the designing and reforming work.

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Hao, Rui Can, De Cai Li, Wen Ming Yang, and Hua Gang Liu. "Study on Magnetic Model and Magnetic Force of Magnetic Fluid in Pressure Difference Sensor." Advanced Materials Research 779-780 (September 2013): 282–85. http://dx.doi.org/10.4028/www.scientific.net/amr.779-780.282.

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Magnetic fluid is the key core of magnetic fluid sensor. Here magnetic model of magnetic fluid is analyzed. The magnetic curve of magnetic fluid is divided into 3 parts and the liner area is presented to make magnetic fluid sensor more sensitively. The magnetic force of magnetic fluid in magnetic field is calculated and analyzed. The magnetic permeability of magnetic fluid in sensor could be treated as a constant in the linear area of magnetization curve. And the magnetic force of magnetic fluid in magnetic field could be ignored if the length to diameter ratio of the solenoid is large enough.