Epitaxial D019-Mn3Ga thin films grown on the paramagnetic and diamagnetic MgO (111) substrate

IF 4.6 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics Pub Date : 2025-09-19 DOI:10.1016/j.rinp.2025.108435

Idris Opeyemi Olayiwola , Ricardo López Antón , Rocío M. Gutiérrez-Pérez , Carlos R. Santillán-Rodríguez , Óscar O. Solís-Canto , Renee J. Sáenz-Hernández , José T. Holguín-Momaca , Sion F. Olive-Méndez

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Abstract

50 nm-thick D0₁₉-Mn₃Ga epitaxial thin films were grown on MgO (111) substrates by rf-magnetron sputtering. Structural characterization demonstrated the single crystalline nature of the films grown at 400 and 500 °C, while those grown at 600 °C show an epitaxial mosaic-like growth together with the crystallization of the tetragonal D0₂₂ phase. The magnetic measurements evidenced the presence of diamagnetic and paramagnetic contributions due to the substrate, with the paramagnetic contribution probably due to magnetic impurities with concentration below 1 % atomic. We removed those contributions in both the magnetization-magnetic field and magnetization-temperature curves. After that correction, the magnetic loops of the D0₁₉-Mn₃Ga thin films were decomposed in antiferromagnetic and ferromagnetic components, employing the Brillouin function, the latest arising from the canting of the magnetic moment of the Mn atoms and the distortion of the kagome spin structure, of the D0₁₉ phase, at the boundaries between single crystalline domains as well as the ferrimagnetic contribution of the D0₂₂ clusters.

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在顺磁性和抗磁性MgO（111）衬底上生长的外延D019-Mn3Ga薄膜

采用射频磁控溅射技术在MgO（111）衬底上生长了50 nm厚的D019-Mn3Ga外延薄膜。结构表征表明，在400°C和500°C下生长的薄膜具有单晶性质，而在600°C下生长的薄膜则表现为外延镶嵌状生长，并伴有四角形D022相的结晶。磁性测量证明了衬底的抗磁性和顺磁性贡献的存在，顺磁性贡献可能是由于原子浓度低于1%的磁性杂质。我们在磁化-磁场和磁化-温度曲线中都去掉了这些贡献。修正后，D019- mn3ga薄膜的磁环被分解为反铁磁性和铁磁性组分，利用布里因函数，该函数是由Mn原子的磁矩倾斜和D019相的kagome自旋结构的畸变引起的，在单晶畴之间的边界以及D022团簇的铁磁性贡献。

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来源期刊

Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY

CiteScore

8.70

自引率

9.40%

发文量

754

审稿时长

50 days

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