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Temperature dependence of large exchange-bias in TbFe-Co/Pt

Authors :
Hans J. Hug
C. E. Corticelli
S. Oezer
Sara Romer
Hartmut Rohrmann
Kerstin Thorwarth
Niraj Joshi
Miguel A. Marioni
Magdalena Parlinska-Wojtan
Source :
Applied Physics Letters. 101:222404
Publication Year :
2012
Publisher :
AIP Publishing, 2012.

Abstract

The exchange-bias effect provides unidirectional anisotropy to ferromagnetic thin-films in GMR and TMR sensors. It is weak because it relies on an inherently compensated coupling across a ferromagnet/antiferromagnet interface. We replace the antiferromagnet with a TbFe-based perpendicular-anisotropy amorphous ferrimagnet, coupling to an adjacent ferromagnet with 13-5 mJ/m2 for temperatures within 7.9–280 K. A large exchange-bias between 1.1 and 0.7 T in that temperature range ensues. The temperature dependence of the bias is step-like, and thus different from that of antiferromagnet-based exchange-bias systems. It suggests using this material in exchange-biased temperature assisted magnetic writing.

Details

ISSN :
10773118 and 00036951
Volume :
101
Database :
OpenAIRE
Journal :
Applied Physics Letters
Accession number :
edsair.doi...........edf523b47a0679786aaa064180f02f3b
Full Text :
https://doi.org/10.1063/1.4767142