Coercivity mechanisms in nanocrystalline Sm–Co–Cu thin films: the spring effect

IF 3.674 4区工程技术 Q1 Engineering Applied Nanoscience Pub Date : 2023-07-15 DOI:10.1007/s13204-023-02931-1

Sergio Antonio Romero, Daniel Rodrigues Jr, Tarsis Germano, Renato Cohen, Jose´Adilson de Castro, Marcos Flavio de Campos

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引用次数: 1

Abstract

In magnetron sputtering, with the simultaneous deposition of SmCo and copper, it is possible for tailoring the coercive field of SmCoCu thin films. Microstructural analysis pointed out that nanocrystalline 2:17 rhombohedral phase with diameter 10–100 nm was obtained, and coercivities in the range between 3 and 8.5 kOe. These characteristics are suitable for magnetic recording. The coercivity mechanisms are discussed. The initial magnetization curve, measured in thermally demagnetized samples, is used to discuss the coercivity mechanisms. A spring effect in the samples is observed. The spring effect is due to reversible rotation of magnetization and indicates that the coercivity mechanism is nucleation or coherent rotation of single domain size nanoscale grains. Structural data refined with X-ray diffraction Rietveld analysis for Sm₂(Co,Cu)₁₇ rhombohedral phase, Sm(Co,Cu)₅ phase and cubic oxide Sm₂O₃ phase are provided.

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纳米晶Sm–Co–Cu薄膜的矫顽机制：弹簧效应

在磁控溅射中，通过同时沉积SmCo和铜，可以调整SmCoCu薄膜的矫顽场。微观结构分析指出，获得了直径为10–100 nm的纳米晶体2:17菱面体相，矫顽力在3至8.5 kOe之间。这些特性适用于磁记录。讨论了矫顽力机制。在热消磁样品中测量的初始磁化曲线用于讨论矫顽力机制。在样品中观察到弹簧效应。弹簧效应是由于磁化的可逆旋转，表明矫顽力机制是单畴尺寸纳米晶粒的成核或相干旋转。提供了用X射线衍射Rietveld分析对Sm2（Co，Cu）17菱面体相、Sm（Co，铜）5相和立方氧化物Sm2O3相进行精细化的结构数据。

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来源期刊

Applied Nanoscience Materials Science-Materials Science (miscellaneous)

CiteScore

7.10

自引率

0.00%

发文量

430

期刊介绍： Applied Nanoscience is a hybrid journal that publishes original articles about state of the art nanoscience and the application of emerging nanotechnologies to areas fundamental to building technologically advanced and sustainable civilization, including areas as diverse as water science, advanced materials, energy, electronics, environmental science and medicine. The journal accepts original and review articles as well as book reviews for publication. All the manuscripts are single-blind peer-reviewed for scientific quality and acceptance.