Observation of large exchange bias field in Mn rich NiMnAl Heusler alloy thin film

Mishra, A and Dubey, Paritosh and Chandra, R and Srivastava, S K (2021) Observation of large exchange bias field in Mn rich NiMnAl Heusler alloy thin film. Journal of Magnetism and Magnetic Materials, 532 .

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In the present work exchange bias in Mn rich Ni-Mn-Al film has been studied. The film has been deposited by cosputtering from the targets of Ni, Mn and Al. It exhibits an antiferromagnetic B2 phase at room temperature. At low temperature, magnetization versus temperature (M-T) measurement shows a bifurcation among ZFC and FC curves. Hysteresis (M-H) loops measurements reveal the occurrence of exchange bias phenomenon at low temperature. Large HEB of 2.2 kOe for 20 kOe cooling field has been observed. There occurs a field induced ordering at temperature similar to 50 K reflected as coinciding ZFC (zero-field cooled) and FC (field-cooled) curves at large magnetic field. AC susceptibility measurement indicates the occurrence of cluster glass behaviour at low temperature. The exchange constant obtained from the best fit to the experimental data was found to be Ji approximate to -2 meV. The negative interface exchange constant indicates AFM coupling occurs among the coexisting phases. Exchange bias phenomenon may be associated to the coexistence of antiferromagnetic and ferromagnetic like ordering at low temperature. Cooling field dependence of H-EB and coercive field H-C indicate that an increase in anisotropy and growth of ferromagnetic clusters occurs at high magnetic field.

Item Type:Article
Official URL/DOI:https://10.1016/j.jmmm.2021.167964
Uncontrolled Keywords:Thin film; Exchange bias; Cosputtering; Cluster glass; AC susceptibility; Antiferromagnetic coupling; Martensitic transformations
Divisions:Material Science and Technology
ID Code:8416
Deposited By:Dr Mita Tarafder
Deposited On:06 Oct 2021 11:31
Last Modified:06 Oct 2021 11:31
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