Chiral magnetic excitations in FeGe films

Turgut, Emrah; Park, Albert; Nguyen, Kayla; Moehle, Austin; Muller, David A.; Fuchs, Gregory D.

doi:10.1103/physrevb.95.134416

Title: Chiral magnetic excitations in FeGe films

Journal Article · Wed Apr 12 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.95.134416· OSTI ID:1535886

Turgut, Emrah ^[1]; Park, Albert ^[1]; Nguyen, Kayla ^[1]; Moehle, Austin ^[1]; Muller, David A. ^[2]; Fuchs, Gregory D. ^[2]

Cornell Univ., Ithaca, NY (United States). School of Applied and Engineering Physics
Cornell Univ., Ithaca, NY (United States). School of Applied and Engineering Physics; Kavli Inst. at Cornell for Nanoscale Science, Ithaca, NY (United States)

Although chiral magnetic materials have emerged as a potential ingredient in future spintronic memory devices, there are few comprehensive studies of magnetic properties in scalably grown thin films. We present growth, systematic physical and magnetic characterization, and microwave absorption spectroscopy of B20 FeGe thin films. We also perform micromagnetic simulations and apply analytical theory to understand the dynamical magnetic behavior of this material. We find magnetic resonance features in both the helical and field-polarized magnetic states, which are well explained by micromagnetic simulations and analytical calculations. In particular, we show the resonant enhancement of spin waves along the FeGe film thickness that has a wave vector matching the helical vector. Using our analytic model, we also describe the resonance frequency of a helical magnetic state in bulk materials and thin films, which depends strongly on its untwisting field. Our results pave the way for understanding and manipulating high frequency spin waves in thin-film chiral magnet FeGe near room temperature.

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Research Organization:: Cornell Univ., Ithaca, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012245

OSTI ID:: 1535886

Alternate ID(s):: OSTI ID: 1351667

Journal Information:: Physical Review B, Vol. 95, Issue 13; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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