Exchange bias effects in Heusler alloy Ni2MnAl/Fe bilayers
- 13 May 2016
- journal article
- research article
- Published by IOP Publishing in Journal of Physics D: Applied Physics
- Vol. 49 (23), 235001
- https://doi.org/10.1088/0022-3727/49/23/235001
Abstract
Ni2MnAl Heusler alloy thin films were epitaxially grown on MgO(1 0 0) single crystal substrates by ultra-high-vacuum magnetron sputtering technique. X-ray diffraction and transmission electron microscopy observation revealed that the structures of all the Ni2MnAl thin films were B2-ordered regardless of the deposition temperature ranging from room temperature to 600 °C. The temperature dependence of electrical resistivity showed a kink about 280 K, which was consistent with a reported value of the Néel temperature for antiferromagnetic B2-Ni2MnAl. The magnetization curves of Ni2MnAl/Fe bilayer samples showed a shift caused by the interfacial exchange interaction at 10 K. The maximum value of the exchange bias field H ex was 55 Oe corresponding to the exchange coupling energy J k of 0.03 erg cm−2.Keywords
Funding Information
- Japan Science and Technology Agency (SICORP-EU, HARFIR)
- European Commission (NMP3-SL-2013-604398)
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