Large magnetoresistance in highly textured Mn44.7Ni43.5Sn11.8 melt spun ribbons

Highly textured Heusler alloy Mn44.7Ni43.5Sn11.8 ribbons were prepared by melt spinning. The magnetoresistance (MR) properties were evaluated by the magnetic field perpendicular to the ribbon surface with the field up to 30 kOe. A large MR (about 25%) with a lower magnetic field (10 kOe) was obtained at 276 K. Due to the rapid solidification. The ribbons with a specific texture can get a large MR twice than polycrystalline alloys at the same magnetic field. The highly textured Mn-Ni-Sn melt spun ribbons may be broadly applied in magnetic memory and as temperature and magnetic sensors as well

Efikasi salap sulfur untuk pengobatan skabies pada kambing lokal

VII+13hlm.;29c

Reversibly controlled magnetic domains of Co film via electric field driven oxygen migration at nanoscale

Electric field control of perpendicular magnetic anisotropy (PMA) can enable low power consumption for perpendicular magnetic random access memory devices. However, the tuning of PMA by the electric field in ferromagnetic metal thin films is less efficient and limited to the interface due to the screening effect. Alternatively, the magnetoionic effect can control PMA efficiently, which utilizes ion migrations over the surface of the ferromagnetic metal by interfacing it with the charge reservoir of oxygen ions like GdOx. In this paper, we report the reversibly controlled magnetic domains of PMA Co in the Pt/Co/GdOx trilayer via the electric field at the nanoscale using conductive atomic force microscopy and magnetic force microscopy (MFM). The magnetic domain phase values determined by MFM decrease and increase when negative and positive bias voltages of magnitude 4V are applied to the surface of GdOx, respectively. These results suggest a path toward control of PMA materials at the nanoscale by the electric field for information storage devices.National Key R&D Program of China [2016YFA0201102]; National Natural Science Foundation of China [51871232, 51571208, 51525103, 6171101158]; Key Research Program of the Chinese Academy of Sciences [KJZD-EW-M05]; Ningbo Science and Technology Bureau (2025 ST Megaprojects); Ningbo Science and Technology Innovation Team [2015B11001]; Youth Innovation Promotion Association of the Chinese Academy [2016270]12 month embargo; published online: 10 June 2019This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]

Large Magnetoresistance and Magnetic Field Induced Strain in Ni42.8Co7.7Mn38.8Al10.7 Heusler Alloy at Room Temperature

Large magnetoresistance and large magnetic field induced strain are observed in polycrystalline Ni42.8Co7.7Mn38.8Al10.7 Heusler alloy. The martensitic transformation from ferromagnetic austenite to weak-magnetic martensite is realized in the alloy around the room temperature. A magentoresistance of -45% and magnetic field induced strain up to -500ppm are observed under the magnetic field of 90kOe. The evolution of the topography and magnetic domain is measured by magnetic force microscopy under different magnetic fields. Dramatic changes in magnetic domain structures are observed and discussed in the martensitic transformation process. The magnetic field induced reverse martensitic transformation should account for the large magnetoresistance and magnetic field induced strain. The results indicate the potential application of Ni42.8Co7.7Mn38.8Al10.7 alloy in magnetic multifunctional materials

Large Magnetocaloric Effect and Magnetoresistance in Fe and Co Co-Doped Ni-Mn-Al Heusler Alloys

The Ni40Co10-xFexMn33Al17 (x = 4, 6, 8) alloys are prepared by arc-melting method. The crystallographic structure, magnetic and magnetoresistance properties are systematically studied. The large magnetic change is obtained across the martensitic transformation from the ferromagnetic austenite phase to weak-magnetic martensite phase. With the increase in Fe/Co ratio, the martensite transformation temperature shifts to the lower temperature. The large values of magnetoresistance of 33.3, 25.7, and 13.1% are achieved at the field of 3T for x = 4, x = 6, and x = 8 alloys around the martensitic transformation, respectively. These results indicate that Ni-Fe-Co-Mn-Al alloy provides the motive power for further research in practical applications