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https://hdl.handle.net/10356/82405
Title: | Magnetization dynamics and its scattering mechanism in thin CoFeB films with interfacial anisotropy | Authors: | Okada, Atsushi He, Shikun Gu, Bo Kanai, Shun Soumyanarayanan, Anjan Lim, Sze Ter Tran, Michael Mori, Michiyasu Maekawa, Sadamichi Matsukura, Fumihiro Ohno, Hideo Panagopoulos, Christos |
Keywords: | CoFeB/MgO Ferromagnetic resonance |
Issue Date: | 2017 | Source: | Okada, A., He, S., Gu, B., Kanai, S., Soumyanarayanan, A., Lim, S. T., et al. (2017). Magnetization dynamics and its scattering mechanism in thin CoFeB films with interfacial anisotropy. Proceedings of the National Academy of Sciences of the United States of America, 114(15), 3815-3820. | Series/Report no.: | Proceedings of the National Academy of Sciences of the United States of America | Abstract: | Studies of magnetization dynamics have incessantly facilitated the discovery of fundamentally novel physical phenomena, making steady headway in the development of magnetic and spintronics devices. The dynamics can be induced and detected electrically, offering new functionalities in advanced electronics at the nanoscale. However, its scattering mechanism is still disputed. Understanding the mechanism in thin films is especially important, because most spintronics devices are made from stacks of multilayers with nanometer thickness. The stacks are known to possess interfacial magnetic anisotropy, a central property for applications, whose influence on the dynamics remains unknown. Here, we investigate the impact of interfacial anisotropy by adopting CoFeB/MgO as a model system. Through systematic and complementary measurements of ferromagnetic resonance (FMR) on a series of thin films, we identify narrower FMR linewidths at higher temperatures. We explicitly rule out the temperature dependence of intrinsic damping as a possible cause, and it is also not expected from existing extrinsic scattering mechanisms for ferromagnets. We ascribe this observation to motional narrowing, an old concept so far neglected in the analyses of FMR spectra. The effect is confirmed to originate from interfacial anisotropy, impacting the practical technology of spin-based nanodevices up to room temperature. | URI: | https://hdl.handle.net/10356/82405 http://hdl.handle.net/10220/43530 |
ISSN: | 0027-8424 | DOI: | 10.1073/pnas.1613864114 | Schools: | School of Physical and Mathematical Sciences | Rights: | © 2017 The author(s) (published by National Academy of Sciences). This is the author created version of a work that has been peer reviewed and accepted for publication in Proceedings of the National Academy of Sciences of the United States of America, published by National Academy of Sciences on behalf of the author(s). It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1073/pnas.1613864114]. | Fulltext Permission: | open | Fulltext Availability: | With Fulltext |
Appears in Collections: | SPMS Journal Articles |
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Magnetization dynamics and its scattering mechanism in thin CoFeB films with interfacial anisotropy.pdf | 1.07 MB | Adobe PDF | View/Open |
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