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Magnetic Damping in EpitaxialIronAlloyed with Vanadium and Aluminum
Physical Review Applied ( IF 3.8 ) Pub Date : 2020-09-15 , DOI: 10.1103/physrevapplied.14.034042
David A. Smith , Anish Rai , Youngmin Lim , Timothy Q. Hartnett , Arjun Sapkota , Abhishek Srivastava , Claudia Mewes , Zijian Jiang , Michael Clavel , Mantu K. Hudait , Dwight D. Viehland , Jean J. Heremans , Prasanna V. Balachandran , Tim Mewes , Satoru Emori

To develop low-moment, low-damping metallic ferromagnets for power-efficient spintronic devices, it is crucial to understand how magnetic relaxation is impacted by the addition of nonmagnetic elements. Here, we compare magnetic relaxation in epitaxial Fe films alloyed with light, nonmagnetic elements of V and Al. FeV alloys exhibit lower intrinsic damping compared with that of pure Fe, reduced by nearly a factor of 2, whereas damping in FeAl alloys increases with Al content. Our experimental and computational results indicate that reducing the density of states at the Fermi level, rather than the average atomic number, has a more significant impact on lowering damping in Fe alloyed with light elements. Moreover, FeV is confirmed to exhibit an intrinsic Gilbert damping parameter of about 0.001, which is among the lowest ever reported for ferromagnetic metals.

中文翻译:

钒铝合金化外延铁中的磁阻尼

为了开发用于高能效自旋电子器件的低力矩,低阻尼金属铁磁体,了解非磁性元素对磁弛豫的影响至关重要。在这里,我们比较外延的磁弛豫 与轻,非磁性元素合金化的薄膜 V-V 合金比纯合金具有更低的固有阻尼 ,减少了将近2倍,而阻尼 - 合金随着 内容。我们的实验和计算结果表明,降低费米能级的态密度而不是平均原子序数,对降低硅中的阻尼具有更大的影响。与轻元素合金化。此外,-V 证实其表现出的固有吉尔伯特阻尼参数约为0.001,这是有史以来铁磁金属中最低的。
更新日期:2020-09-15
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