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Title of Journal: Nano Res

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Abbravation: Nano Research

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Tsinghua University Press

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DOI

10.1007/s12223-011-0067-4

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1998-0000

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Fielddependent spin waves in highaspectratio si

Authors: Semanti Pal Susmita Saha M Venkata Kamalakar Anjan Barman
Publish Date: 2016/09/29
Volume: 9, Issue: 5, Pages: 1426-1433
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Abstract

We investigate the spin wave SW modes in highaspectratio singlecrystal ferromagnetic nanowires FMNWs using an alloptical timeresolved magnetooptical Kerr effect TRMOKE microscope The precessional magnetization dynamics in such FMNWs unveil the presence of uniform and quantized SW modes that can be tuned by varying the bias magnetic field H The frequencies of the modes are observed to decrease systematically with a decreasing magnetic field and the number of modes in the spectrum is reduced from four to three for H 07 kOe To understand these results we perform micromagnetic simulations that reveal the presence of edge standing wave and uniform SW modes in the nanowires NWs Our simulations clearly show how the standing wave and uniform SW modes coalesce to form a single mode with uniform precession over the entire NW for H 07 kOe reproducing the experimentally observed reduction in modes Our study elucidates the possibility of manipulating the SW modes in magnetic nanostructures which is useful for applications in magnonic and spintronic devices

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