Please use this identifier to cite or link to this item: 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
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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