Controllable exchange bias in Fe/metamagnetic FeRh bilayers

We report the studies of tuning the exchange bias at ferromagnetic Fe/metamagnetic FeRh bilayer interfaces. Fe/FeRh(111) bilayers show exchange bias in the antiferromagnetic state of FeRh while no exchange bias occurs at Fe/FeRh(001) interface. The contrasting results are attributed to the spin conf...

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Bibliographic Details
Published in:Applied physics letters 2014-10, Vol.105 (17)
Main Authors: Suzuki, Ippei, Hamasaki, Yosuke, Itoh, Mitsuru, Taniyama, Tomoyasu
Format: Article
Language:English
Subjects:
ANTIFERROMAGNETISM
Applied physics
Bias
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CONFIGURATION
Configurations
Crystallography
Exchanging
Ferromagnetism
INTERFACES
IRON ALLOYS
LAYERS
MAGNETIC MATERIALS
RHODIUM ALLOYS
SPIN
TRANSITION TEMPERATURE
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Summary:We report the studies of tuning the exchange bias at ferromagnetic Fe/metamagnetic FeRh bilayer interfaces. Fe/FeRh(111) bilayers show exchange bias in the antiferromagnetic state of FeRh while no exchange bias occurs at Fe/FeRh(001) interface. The contrasting results are attributed to the spin configurations of FeRh at the interface, i.e., the uncompensated ferromagnetic spin configuration of FeRh appears exclusively for (111) orientation. The exchange bias disappears as the bilayers are warmed above the antiferromagnetic-ferromagnetic transition temperature. The direction of the exchange bias for Fe/FeRh(111) is also found to be perpendicular to the cooling-field direction, in contrast to the commonly observed direction of exchange bias for ferromagnetic/antiferromagnetic interfaces. In view of these results, the exchange bias in Fe/FeRh bilayers with the (111) crystallographic orientation should be useful for the design of rapid writing technology for magnetic information devices.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4900619