Influence of Periodic Patterning on the Magnetization Response of Micromagnetic Structures

Author

Sang-Hyun Lim ; Wallis, T.M. ; Imtiaz, A. ; Dazhen Gu ; Krivosik, P. ; Kabos, P.

Author_Institution

Nat. Inst. of Stand. & Technol., Boulder, CO, USA

Volume

2

fYear

2011

fDate

7/3/1905 12:00:00 AM

Firstpage

3500104

Lastpage

3500104

Abstract

The magnetization response of single, patterned, thin-film Permalloy (Ni_80Fe_20, Py) elements embedded in a coplanar waveguide (CPW) is investigated. The anisotropic magnetoresistance (AMR) effect serves as the detection mechanism in current-modulated differential resistance (dV/ dI) and rectification effect measurements, which reveal magnetization dynamics over a broad frequency range. Differently shaped Py elements had distinctly different magnetization responses. In rectangular Py elements, the dynamic low frequency response shows two resonant excitations, whereas multimode ferromagnetic resonance (FMR) occurs in the high frequency range. Disk-shaped patterning significantly increases the magnetic loss in comparison to simple rectangular elements.

Keywords

Permalloy; coplanar waveguides; enhanced magnetoresistance; ferromagnetic resonance; magnetic thin films; magnetisation; metallic thin films; micromagnetics; rectification; Ni₈₀Fe₂₀; anisotropic magnetoresistance effect; coplanar waveguide; current-modulated differential resistance; disk-shaped patterning; magnetic loss; magnetization dynamics; micromagnetic structure; multimode ferromagnetic resonance; periodic patterning; rectification effect; resonant excitation; single thin-film permalloy elements; Frequency measurement; Magnetic domains; Magnetic resonance; Magnetization; Perpendicular magnetic anisotropy; Magnetodynamics; anisotropic magnetoresistance (AMR); ferromagnetic resonance (FMR); spin rectification;

fLanguage

English

Journal_Title

Magnetics Letters, IEEE

Publisher

ieee

ISSN

1949-307X

Type

jour

DOI

10.1109/LMAG.2011.2119394

Filename

5739675