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Nonlinear ferromagnetic resonance shift in submicron Permalloy ellipses
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Engineering Material Physics.ORCID iD: 0000-0003-4889-4210
2015 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 91, no 6, 064426Article in journal (Refereed) Published
Abstract [en]

We report a systematic study of nonlinearity in the ferromagnetic resonance of a series of submicron Permalloy ellipses with varying aspect ratios. At high excitation powers, the resonances are found to shift to higher or lower applied field. We focus here on the sign of the shift and its dependence on the applied field and shape-induced anisotropy of the ellipses. Using ferromagnetic resonance force microscopy, we find that the measured nonlinear coefficient changes sign as a function of anisotropy field and applied field in qualitative agreement with a macrospin analysis. This macrospin analysis also points to origins of the nonlinearity in a combination of hard-axis in-plane anisotropy and precession ellipticity. In comparison of the macrospin predictions with both experimental and micromagnetic modeling results, we measure/model values of the nonlinear coefficient that are more positive than predicted by the macrospin model. The results are useful in understanding nonlinear physics in nanomagnets and applications of spin-torque oscillators.

Place, publisher, year, edition, pages
2015. Vol. 91, no 6, 064426
Keyword [en]
Oscillator, Modes
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Other Physics Topics
URN: urn:nbn:se:kth:diva-163468DOI: 10.1103/PhysRevB.91.064426ISI: 000350317300016ScopusID: 2-s2.0-84924036582OAI: diva2:800850
Swedish Research CouncilCarl Tryggers foundation

QC 20150408

Available from: 2015-04-08 Created: 2015-04-07 Last updated: 2015-04-08Bibliographically approved

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Belova, Lyubov M.
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