Effect of Thermal Processing on the Structural and Magnetic Properties of Epitaxial Co₂FeGe Films.

IF 4.4 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY Nanomaterials Pub Date : 2024-10-30 DOI:10.3390/nano14211745

Andrii Vovk, Dariia Popadiuk, Bogdan Postolnyi, Sergey Bunyaev, Pavel Štrichovanec, José Ángel Pardo, Pedro Antonio Algarabel, Olga Salyuk, Vladislav Korenivski, Gleb N Kakazei, Vladimir O Golub, João Pedro Araujo

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Abstract

The structure and magnetic properties of epitaxial Heusler alloy films (Co₂FeGe) deposited on MgO (100) substrates were investigated. Films of 60 nm thickness were prepared by magnetron co-sputtering at different substrate temperatures (T_S), and those deposited at room temperature were later annealed at various temperatures (T_a). X-ray diffraction confirmed (001) [110] Co₂FeGe || (001) [100] MgO epitaxial growth. A slight tetragonal distortion of the film cubic structure was found in all samples due to the tensile stress induced by the mismatch of the lattice parameters between Co₂FeGe and the substrate. Improved quality of epitaxy and the formation of an atomically ordered L2₁ structure were observed for films processed at elevated temperatures. The values of magnetization increased with increasing T_S and T_a. Ferromagnetic resonance (FMR) studies revealed 45° in-plane rotation of the easy anisotropy axis direction depending on the degree of the tetragonal distortion. The film annealed at T_a = 573 K possesses the minimal FMR linewidth and magnetic damping, while both these parameters increase for another T_S and T_a. Overall, this study underscores the crucial role of thermal treatment in optimizing the magnetic properties of Co₂FeGe films for potential spintronic and magnonic applications.

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热处理对外延 Co2FeGe 薄膜结构和磁性能的影响

研究了沉积在氧化镁（100）基底上的外延 Heusler 合金薄膜（Co2FeGe）的结构和磁性能。在不同的基底温度（TS）下通过磁控共溅射制备了厚度为 60 nm 的薄膜，在室温下沉积的薄膜随后在不同的温度（Ta）下退火。X 射线衍射证实了 (001) [110] Co2FeGe || (001) [100] MgO 的外延生长。由于 Co2FeGe 和基底之间的晶格参数不匹配所引起的拉伸应力，所有样品的薄膜立方结构都出现了轻微的四方畸变。在高温下加工的薄膜外延质量提高，并形成了原子有序的 L21 结构。磁化值随着 TS 和 Ta 的增加而增加。铁磁共振 (FMR) 研究表明，易各向异性轴方向的 45° 平面内旋转取决于四方畸变的程度。在 Ta = 573 K 下退火的薄膜具有最小的 FMR 线宽和磁阻尼，而随着 TS 和 Ta 的增加，这两个参数都会增加。总之，这项研究强调了热处理在优化 Co2FeGe 薄膜磁性能方面的关键作用，可用于潜在的自旋电子和磁性应用。

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来源期刊

Nanomaterials NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

8.50

自引率

9.40%

发文量

3841

审稿时长

14.22 days

期刊介绍： Nanomaterials (ISSN 2076-4991) is an international and interdisciplinary scholarly open access journal. It publishes reviews, regular research papers, communications, and short notes that are relevant to any field of study that involves nanomaterials, with respect to their science and application. Thus, theoretical and experimental articles will be accepted, along with articles that deal with the synthesis and use of nanomaterials. Articles that synthesize information from multiple fields, and which place discoveries within a broader context, will be preferred. There is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental or methodical details, or both, must be provided for research articles. Computed data or files regarding the full details of the experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. Nanomaterials is dedicated to a high scientific standard. All manuscripts undergo a rigorous reviewing process and decisions are based on the recommendations of independent reviewers.