Ferromagnetic Resonance Study on a Grid of Permalloy Nanowires

Venkateswarlu, D and Padmalekha, KG and Bhat, SV and Kumar, Anil PS (2013) Ferromagnetic Resonance Study on a Grid of Permalloy Nanowires. In: IEEE TRANSACTIONS ON MAGNETICS, 49 (7). pp. 3097-3100.

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Abstract

We report ferromagnetic resonance (FMR) study on a grid formed with permalloy nanowires to understand the spin wave dynamics. The presence of two sets of magnetic nanowires perpendicular to each other in the same device enables better control over spin waves. The grid was fabricated using e-beam lithography followed by DC-Magnetron sputtering and liftoff technique. It has dimensions of 800 +/- 10 and 400 +/- 10 nm as periods along X and Y directions with permalloy wires of width 145 +/- 10 nm. FMR studies were done at X-band (9.4 GHz) with the field sweep up to 1 Tesla. The in-plane angular variation of resonant fields shows that there are two well separated modes present, indicating two uniaxial anisotropy axes which are perpendicular to each other. The variation in the intensities in the FMR signal w.r.t. the grid angle is used to describe the spin wave confinement in different regions of the grid. We also explained the asymmetry in the magnetic properties caused by the geometrical property of the rectangular grid and the origin for the peak splitting for the modes occurring at higher resonant fields. Micromagnetic simulations based on OOMMF with two dimensional periodic boundary conditions (2D-PBC) are used to support our experimental findings.

Item Type:	Journal Article
Publication:	IEEE TRANSACTIONS ON MAGNETICS
Publisher:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Additional Information:	Copyright of this article is belongs to IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords:	Antidots; demagnetization fields; ferromagnetic resonance (FMR); grid; micromagnetics; nanowires; OOMMF; PBC; shape anisotropy
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	02 Oct 2013 06:04
Last Modified:	02 Oct 2013 06:04
URI:	http://eprints.iisc.ac.in/id/eprint/47362

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