Spin-wave eigenmodes in single disk-shaped FeB nanomagnet

Jaehun Cho; Shinji Miwa; Kay Yakushiji; Shingo Tamaru; Hitoshi Kubota; Akio Fukushima; Satoshi Fujimoto; Eiiti Tamura; Chun Yeol You; Shinji Yuasa; Yoshishige Suzuki

doi:10.1103/PhysRevB.94.184411

Spin-wave eigenmodes in single disk-shaped FeB nanomagnet

Jaehun Cho
, Shinji Miwa
, Kay Yakushiji
, Shingo Tamaru
, Hitoshi Kubota
, Akio Fukushima
, Satoshi Fujimoto
, Eiiti Tamura
, Chun Yeol You
, Shinji Yuasa
, Yoshishige Suzuki

Department of Physics and Chemistry

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Spin-wave eigenmodes in a disk-shaped FeB nanomagnet were investigated using magnetic tunnel junctions with a FeB magnetic layer and MgO barrier. Noise spectrum measurements for a perpendicularly magnetized junction of 120 nm in diameter showed thermal excitation of distinct spin-wave modes. The measured spectra were compared with analytical calculations and numerical simulations. As a result, the observed modes were classified as spin-wave eigenmodes with various nodal circles and nodal diameter modes by taking into account splitting between directional spin-wave modes originating from dynamic dipolar interaction instead of Dzyaloshinskii-Moriya interaction. These results provide a fundamental understanding of spin dynamics in nanosize spintronic devices.

Original language	English
Article number	184411
Journal	Physical Review B
Volume	94
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevB.94.184411
State	Published - 2016

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Publisher Copyright:
© 2016 American Physical Society.

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title = "Spin-wave eigenmodes in single disk-shaped FeB nanomagnet",

abstract = "Spin-wave eigenmodes in a disk-shaped FeB nanomagnet were investigated using magnetic tunnel junctions with a FeB magnetic layer and MgO barrier. Noise spectrum measurements for a perpendicularly magnetized junction of 120 nm in diameter showed thermal excitation of distinct spin-wave modes. The measured spectra were compared with analytical calculations and numerical simulations. As a result, the observed modes were classified as spin-wave eigenmodes with various nodal circles and nodal diameter modes by taking into account splitting between directional spin-wave modes originating from dynamic dipolar interaction instead of Dzyaloshinskii-Moriya interaction. These results provide a fundamental understanding of spin dynamics in nanosize spintronic devices.",

author = "Jaehun Cho and Shinji Miwa and Kay Yakushiji and Shingo Tamaru and Hitoshi Kubota and Akio Fukushima and Satoshi Fujimoto and Eiiti Tamura and You, \{Chun Yeol\} and Shinji Yuasa and Yoshishige Suzuki",

note = "Publisher Copyright: {\textcopyright} 2016 American Physical Society.",

year = "2016",

doi = "10.1103/PhysRevB.94.184411",

language = "English",

volume = "94",

journal = "Physical Review B",

issn = "2469-9950",

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T1 - Spin-wave eigenmodes in single disk-shaped FeB nanomagnet

AU - Cho, Jaehun

AU - Miwa, Shinji

AU - Yakushiji, Kay

AU - Tamaru, Shingo

AU - Kubota, Hitoshi

AU - Fukushima, Akio

AU - Fujimoto, Satoshi

AU - Tamura, Eiiti

AU - You, Chun Yeol

AU - Yuasa, Shinji

AU - Suzuki, Yoshishige

PY - 2016

Y1 - 2016

N2 - Spin-wave eigenmodes in a disk-shaped FeB nanomagnet were investigated using magnetic tunnel junctions with a FeB magnetic layer and MgO barrier. Noise spectrum measurements for a perpendicularly magnetized junction of 120 nm in diameter showed thermal excitation of distinct spin-wave modes. The measured spectra were compared with analytical calculations and numerical simulations. As a result, the observed modes were classified as spin-wave eigenmodes with various nodal circles and nodal diameter modes by taking into account splitting between directional spin-wave modes originating from dynamic dipolar interaction instead of Dzyaloshinskii-Moriya interaction. These results provide a fundamental understanding of spin dynamics in nanosize spintronic devices.

AB - Spin-wave eigenmodes in a disk-shaped FeB nanomagnet were investigated using magnetic tunnel junctions with a FeB magnetic layer and MgO barrier. Noise spectrum measurements for a perpendicularly magnetized junction of 120 nm in diameter showed thermal excitation of distinct spin-wave modes. The measured spectra were compared with analytical calculations and numerical simulations. As a result, the observed modes were classified as spin-wave eigenmodes with various nodal circles and nodal diameter modes by taking into account splitting between directional spin-wave modes originating from dynamic dipolar interaction instead of Dzyaloshinskii-Moriya interaction. These results provide a fundamental understanding of spin dynamics in nanosize spintronic devices.

UR - https://www.scopus.com/pages/publications/84995395683

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DO - 10.1103/PhysRevB.94.184411

M3 - Article

AN - SCOPUS:84995395683

SN - 2469-9950

VL - 94

JO - Physical Review B

JF - Physical Review B

IS - 18

M1 - 184411

ER -

Spin-wave eigenmodes in single disk-shaped FeB nanomagnet

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