Termination layer compensated tunnelling magnetoresistance in ferrimagnetic Heusler compounds with high perpendicular magnetic anisotropy

Jaewoo Jeong, Yari Ferrante, Sergey V. Faleev, Mahesh G. Samant, Claudia Felser and Stuart S. P. Parkin ()
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Jaewoo Jeong: IBM Almaden Research Center
Yari Ferrante: IBM Almaden Research Center
Sergey V. Faleev: IBM Almaden Research Center
Mahesh G. Samant: IBM Almaden Research Center
Claudia Felser: Max-Planck Institute for Chemical Physics of Solids
Stuart S. P. Parkin: IBM Almaden Research Center

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract Although high-tunnelling spin polarization has been observed in soft, ferromagnetic, and predicted for hard, ferrimagnetic Heusler materials, there has been no experimental observation to date of high-tunnelling magnetoresistance in the latter. Here we report the preparation of highly textured, polycrystalline Mn3Ge films on amorphous substrates, with very high magnetic anisotropy fields exceeding 7 T, making them technologically relevant. However, the small and negative tunnelling magnetoresistance that we find is attributed to predominant tunnelling from the lower moment Mn–Ge termination layers that are oppositely magnetized to the higher moment Mn–Mn layers. The net spin polarization of the current reflects the different proportions of the two distinct termination layers and their associated tunnelling matrix elements that result from inevitable atomic scale roughness. We show that by engineering the spin polarization of the two termination layers to be of the same sign, even though these layers are oppositely magnetized, high-tunnelling magnetoresistance is possible.

Date: 2016
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DOI: 10.1038/ncomms10276

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