Observation of Stray Fields From Hard-Disk Writer Poles up to 2 GHz

Author

Koblischka, M.R. ; Wei, J.D. ; Sulzbach, T. ; Johnston, A.D. ; Hartmann, U.

Author_Institution

Inst. of Exp. Phys., Univ. of Saarbrucken

Volume

43

Issue

6

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

2205

Lastpage

2207

Abstract

By means of high-frequency magnetic force microscope (HF-MFM) the emanating stray fields from hard-disk writer poles are measured at carrier frequencies up to 2 GHz. For the present measurements, hard-disk writer poles stemming from SEAGATE were employed. At 1000 MHz and above, the field directly at the gap is dominating, while the fields along the downtrack direction are found to decrease. The observation of the stray fields at these high frequencies is only possible by employing MFM cantilevers with a 50-nm-thick (Ni,Zn)-ferrite coating. We show that the use of these tips gives much larger signal than those obtained by conventional CoCr-coated cantilevers

Keywords

hard discs; magnetic force microscopy; 1000 MHz; MFM cantilevers; SEAGATE; ferrite coating; hard disk writer poles; magnetic force microscope; stray fields; Coatings; Force measurement; Frequency; Magnetic field measurement; Magnetic force microscopy; Magnetic forces; Magnetic heads; Magnetic hysteresis; Magnetic materials; Sputtering; Frequency characteristics; hard-disk write head; high-frequency measurement; magnetic force microscope;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2007.894122

Filename

4202808