A Nondestructive Local FMR Probe for On-Disk Media Characterization

Author

Clinton, T.W. ; Mircea, Dragos I. ; Benatmane, Nadjib ; Gokemeijer, N.J. ; Wu, Stella ; Harkness, S.D.

Author_Institution

Seagate Res., Seagate Technol., Pittsburgh, PA

Volume

43

Issue

6

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

2319

Lastpage

2321

Abstract

High-frequency characterization of perpendicular media is demonstrated on disk with a novel nondestructive local probe. The probe is micron-scale and has high bandwidth. We measure the permeability of the soft underlayer (SUL) and observe its ferromagnetic resonance (FMR). We extract physical parameters that cannot typically be measured on disk, such as FMR frequency, anisotropy field, H_K, saturation magnetization, M_S, and damping alpha in good agreement with independent measurements. Media of arbitrary form factor can be characterized and any location can be probed with spatial resolution that scales with the size of the probe "tip."

Keywords

ferromagnetic resonance; perpendicular magnetic recording; ferromagnetic resonance; high-frequency characterization; nondestructive local FMR probes; ondisk media characterization; parameter extraction; perpendicular media; saturation magnetization; soft underlayer; Anisotropic magnetoresistance; Bandwidth; Damping; Frequency measurement; Magnetic field measurement; Magnetic resonance; Permeability measurement; Probes; Saturation magnetization; Spatial resolution; Dynamics; magnetic materials; magnetic recording; magnetic resonance; microwave measurements;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2007.893792

Filename

4202683