Journal
THIN SOLID FILMS
Volume 638, Issue -, Pages 298-304Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2017.07.076
Keywords
Thin films; Multilayers; Magnetic properties; Crystal growth; Heusler alloys; Molecular beam epitaxy; Roll-up
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Funding
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES), Brazil [A083/2013]
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We report the fabrication of Ni74Mn20Ga6 alloys on GaAs/AlAs/InGaAs (001) substrates with a native oxide layer by molecular beam epitaxy. The structure and magnetic properties of the alloys are investigated by electron microscopy, x-ray techniques, and magnetization measurements. Relatively smooth films with a granular morphology and a tetragonal structure with ratio c/a = 2.05 (film) are obtained. The alloy shows ferromagnetic behavior at room temperature and the Curie temperature is identified at 320 K. In addition, strong magnetic anisotropy due to strain is observed at low temperatures. The experimental hysteresis curves are compared with micromagnetic simulations. Finally, the roll-up of InGaAs/Ni74Mn20Ga6 bilayers is demonstrated. (C) 2017 Elsevier B.V. All rights reserved.
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