Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 50: Permanent Magnets
MA 50.4: Talk
Thursday, March 19, 2020, 15:45–16:00, HSZ 101
Strong magnetocrystalline anisotropy and magnetic hardness at room-temperature in the rare-earth-free magnet Rh2CoSb — •Yangkun He1, Gerhard Fecher1, Rudolf Schaefer2,3, S. S. P. Parkin4, J. M. D. Coey5, and Claudia Felser1 — 1Max-Planck-Institute for Chemical Physics of Solids, D-01187 Dresden, Germany — 2Institute for Materials Science, TU Dresden, D-01062 Dresden, Germany — 3Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Helmholtzstrasse 20, D01069 Dresden, Germany — 4Max Planck Institute of Microstructure Physics, Halle, Germany — 5School of Physics, Trinity College, Dublin 2, Ireland
Strong uniaxial magnetocrystalline anisotropy is indispensable for a permanent magnet, but it is rarely achieved in rare-earth-free compounds. Here we report a magnetocrystalline anisotropy of 3.62 MJm-3 in single crystals of a tetragonal Heusler compound Rh2CoSb with a saturation magnetization of μ0Ms = 0.52 T at 2 K (2.20 MJm-3 and 0.44 T at room-temperature). The magnetic hardness parameter κ of 3.7 at room temperature is the highest observed for a rare-earth-free magnet. Strong anisotropy is also manifest in the transport properties; the values of electrical and thermal conductivities are twice as large along the c axis as along the a axis and there are significant differences of the anomalous Hall effect and magnetoresistance. Our study illustrates the benefits of designing highly anisotropic rare-earth-free magnets using 4d elements, with potential as future thin film media.