Origin of steps in magnetization loops of martensitic Ni-Mn-Ga films on MgO(001)

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Applied Physics Letters. 2016, 109(13), 132405. ISSN 0003-6951. eISSN 1077-3118. Available under: doi: 10.1063/1.4963264
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We study the temperature dependent magnetization properties of (010)-oriented Ni-Mn-Ga epitaxial films on MgO(001) substrates. In the martensitic phase, we observe pronounced abrupt slope changes in the magnetization loops for all studied samples. Our experimental findings are discussed in conjunction with the micromagnetic simulations, revealing that the characteristic magnetization behavior is governed solely by the magnetization switching within the specific martensitic variant pattern, and no reorientation of twin variants is involved in the process. Our study emphasizes the important role of the magnetostatic interactions in the magnetization behavior of magnetic shape memory alloy thin films.

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ISO 690LAPTEV, Aleksej, Krzysztof LEBECKI, Gesa WELKER, Yuansu LUO, Konrad SAMWER, Mikhail FONIN, 2016. Origin of steps in magnetization loops of martensitic Ni-Mn-Ga films on MgO(001). In: Applied Physics Letters. 2016, 109(13), 132405. ISSN 0003-6951. eISSN 1077-3118. Available under: doi: 10.1063/1.4963264
BibTex
@article{Laptev2016-09-28Origi-36065,
  year={2016},
  doi={10.1063/1.4963264},
  title={Origin of steps in magnetization loops of martensitic Ni-Mn-Ga films on MgO(001)},
  number={13},
  volume={109},
  issn={0003-6951},
  journal={Applied Physics Letters},
  author={Laptev, Aleksej and Lebecki, Krzysztof and Welker, Gesa and Luo, Yuansu and Samwer, Konrad and Fonin, Mikhail},
  note={Article Number: 132405}
}
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