Document Type

Article

Publication Title

Journal of Applied Physics

Publication Date

3-27-2007

Volume

101

Issue

09F501

Disciplines

Biochemistry | Chemistry | Life Sciences | Physical Sciences and Mathematics | Physics

Abstract

Permalloy antidot arrays with different square hole sizes ( , , and ) have been fabricated by means of electron-beam lithography and lift-off techniques. The smaller square hole size results in enhanced remanence and reduced coercivity in the antidot array. Multiple resonance modes were clearly observed for the magnetic field applied normal to the array plane, and double uniform resonance modes occurred when the field deviated more than 30° from the normal to the plane. Two distinct dipolar field patterns with different orientations and magnitudes split the uniform resonance into double resonance modes. The double resonance modes show uniaxial in-plane anisotropy and the easy axes are orthogonal. The magnitude of the induced dipolar anisotropy remains almost constant with changes in the square hole size. The double resonance peaks move to low field with reduction of the square hole size.

Keywords

nanomagnetism, spin wave resonance, magnetic fields, permalloys, spin waves, demangetization, coercive force, magnetic films, remanence, anisotrophy

DOI

10.1063/1.2709501

Comments

Link to Publisher's Version

This work was supported through the National Science Foundation under NIRT grant CCF-0403673.

Rights

© 2007 American Institute of Physics

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