Urban, R. and Putilin, A. and Wigen, P. E. and Liou, S.-H. and Cross, M. C. and Hammel, P.C. and Roukes, M. L. (2006) Perturbation of magnetostatic modes observed by ferromagnetic resonance force microscopy. Physical Review B, 73 (21). Art. No. 212410. ISSN 1098-0121 http://resolver.caltech.edu/CaltechAUTHORS:URBprb06
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Magnetostatic modes of yttrium iron garnet (YIG) films are investigated by ferromagnetic resonance force microscopy. A thin-film "probe" magnet at the tip of a compliant cantilever introduces a local inhomogeneity in the internal field of the YIG sample. This influences the shape of the sample's magnetostatic modes, thereby measurably perturbing the strength of the force coupled to the cantilever. We present a theoretical model that explains these observations; it shows that the tip-induced variation of the internal field creates either a local "potential barrier" or "potential well" for the magnetostatic waves. The data and model together indicate that local magnetic imaging of ferromagnets is possible, even in the presence of long-range spin coupling, through the introduction of localized magnetostatic modes predicted to arise from sufficiently strong tip fields.
|Additional Information:||©2006 The American Physical Society (Received 8 February 2006; revised 9 May 2006; published 14 June 2006) We thank Melissa M. Midzor for assistance and discussions. We gratefully acknowledge financial support from ONR MURI under Grant No. DAAD 19-01-0541. P.E.W. was supported by the R.J. Yeh fund during the course of this research.|
|Subject Keywords:||yttrium compounds; garnets; magnetic thin films; ferromagnetic materials; ferromagnetic resonance; magnetic force microscopy; magnetostatics|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Archive Administrator|
|Deposited On:||18 Jun 2006|
|Last Modified:||26 Dec 2012 08:55|
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