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10 September 2019 Conductivity-like damping in epitaxial Fe (Conference Presentation)
Behrouz Khodadadi, Anish Rai, Bhuwan Nepal, Arjun Sapkota, Abhishek Srivastava, Claudia Mewes, Sujan Budhathoki, Adam J. Hauser, Min Gao, Jie-Fang Li, Dwight D. Viehland, Zijian Jiang, Jean J. Heremans, Tim Mewes, Satoru Emori
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Proceedings Volume 11090, Spintronics XII; 1109021 (2019) https://doi.org/10.1117/12.2528426
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States
Abstract
Magnetic damping impacts essential dynamics for spintronic device applications, but its fundamental mechanisms in various materials – including simple ferromagnetic metals – have yet to be understood. Here, we experimentally correlate damping with structural and transport properties of epitaxial thin films of Fe. At room temperature, the effective Gilbert damping parameter is independent of whether these films are coherently strained or partially relaxed. However, at low temperature, we find that coherently strained Fe films with higher crystalline quality and conductivity exhibit higher damping. The enhancement of low-temperature damping is greater than that from classical eddy current loss. Our observation of such conductivity-like damping, possibly governed by the intraband scattering mechanism [1], provides fundamental insight into the role of crystallinity in damping in ferromagnetic metals. [1] K. Gilmore, Y. U. Idzerda, M. D. Stiles, Phys. Rev. Lett. 99, 027204 (2007); M. A. W. Schoen et al. Nat. Phys. 12, 839 (2016).
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Behrouz Khodadadi, Anish Rai, Bhuwan Nepal, Arjun Sapkota, Abhishek Srivastava, Claudia Mewes, Sujan Budhathoki, Adam J. Hauser, Min Gao, Jie-Fang Li, Dwight D. Viehland, Zijian Jiang, Jean J. Heremans, Tim Mewes, and Satoru Emori "Conductivity-like damping in epitaxial Fe (Conference Presentation)", Proc. SPIE 11090, Spintronics XII, 1109021 (10 September 2019); https://doi.org/10.1117/12.2528426
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KEYWORDS
Iron
Crystals
Ferromagnetics
Metals
Astatine
Magnetism
Scattering
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