Effect of oxygen incorporation on dynamic magnetic properties in Ta-O/Co-Fe-B bilayer films under out-of-plane and in-plane magnetic fields
Effect of oxygen incorporation on dynamic magnetic properties in Ta-O/Co-Fe-B bilayer films under out-of-plane and in-plane magnetic fields
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DOI：
10.1063/9.0000297
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发表时间：
2022-03
期刊：
影响因子：
1.6
通讯作者：
T. V. A. Nguyen;Y. Saito;H. Naganuma;S. Ikeda;T. Endoh;Y. Endo
中科院分区：
文献类型：
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作者：
T. V. A. Nguyen;Y. Saito;H. Naganuma;S. Ikeda;T. Endoh;Y. Endo
Ta-O/Co20Fe60B20双层薄膜的动态磁性能受Ta-O层氧化条件的强烈影响。 Ta-O层在0.03 Pa压力（POxygen）下被微量氧气氧化，降低了面内阻尼常数（αIP），并增加了有效磁化强度（4π Ms,eff）。然后，通过将 POxygen 增加到 0.3 Pa，αIP 和 4π Ms,eff 都保持其值。面外阻尼常数 (αOP) 显示出与 αIP 对 POxygen 类似的趋势，尽管在每个 POxygen 中 αOP 都比 αIP 小得多。对于0.03 Pa氧化的样品，αOP达到0.0033。表明αIP由内在阻尼和外在阻尼组成，而αOP更接近内在阻尼。通过氧化控制αOP和αIP将有利于高频自旋电子器件的设计。
Dynamic magnetic properties of Ta-O/Co20Fe60B20 bilayer films are strongly influenced by the oxidation condition of the Ta-O layer. The oxidation of the Ta-O layer by a slight amount of oxygen with a pressure ( POxygen) of 0.03 Pa decreases in-plane damping constant ( αIP), and increases the effective magnetization (4π Ms,eff). Then, both αIP and 4π Ms,eff maintain their values by increasing POxygen up to 0.3 Pa. The out-of-plane damping constant ( αOP) showed a similar tendency to that of αIP against POxygen, although αOP is much smaller than αIP in every POxygen. αOP reaches to 0.0033 for sample oxidized at 0.03 Pa. It was suggested that αIP consists of both the intrinsic damping and the extrinsic damping, while αOP is closer to the intrinsic damping. The control of αOP and αIP by the oxidation would be beneficial in designing the high frequency spintronic devices.