Amorphous rare-earth transition-metal alloys revisited

J. Michael D. Coey

doi:10.1117/12.3028305

4 October 2024 Amorphous rare-earth transition-metal alloys revisited

J. Michael D. Coey

Proceedings Volume PC13119, Spintronics XVII; PC131190I (2024) https://doi.org/10.1117/12.3028305
Event: Nanoscience + Engineering, 2024, San Diego, California, United States

Abstract

Amorphous alloys of cobalt with a small concentration <10% of nonmagnetic rare earths (Sc, Y, La, Lu) allow us to infer the magnetic behavior of pure amorphous Co, which should exhibit a Curie temperature approaching 2000 K and a local random anisotropy energy of about 10 K/atom, which is exchange averaged in the strong ferromagnetic exchange to give soft ferromagnetic films with negligible coercivity. The amorphous films can therefore carry strongly spin-polarized and orbital currents, that could open new opportunities in orbitronic electron transport. Corresponding amorphous iron alloys are quite different, with a broad distribution of mainly ferromagnetic with some antiferromagnetic nearest-neighbor coupling, that leads to spin freezing at a temperature of order 100 K. Analysis of the spin flop transition near compensation in amorphous R-Co alloys with non-S-state rare earths, where the random anisotropy experienced by the rare earth is not exchange averaged in the Co-R exchange field, leads to the conclusion that strong random pinning of the R moments to the local anisotropy directions cannot be described by the a simple random axial anisotropy model.

Conference Presentation

Citation Download Citation

J. Michael D. Coey "Amorphous rare-earth transition-metal alloys revisited", Proc. SPIE PC13119, Spintronics XVII, PC131190I (4 October 2024); https://doi.org/10.1117/12.3028305

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