High resolution imaging of thin-film recording heads by superparamagnetic magnetic force microscopy tips

Authors

Sy_Hwang Liou, University of Nebraska-LincolnFollow
S.S. Malhotra, University of Nebraska - Lincoln
John Moreland, National Institute of Standards and Technology, Boulder, Colorado
P.F. Hopkins, Quantum Peripherals of Colorado, Louisville, Colorado

Date of this Version

January 1997

Comments

Published by American Institute of Physics. Appl. Phys. Lett., 70, 135(1997). © 1997 American Institute of Physics. Permission to use. http://jap.aip.org/jap/.

Abstract

We have used superparamagnetic magnetic force microscopy (MFM) tips to obtain high spatial resolution MFM images of recording heads. Profiles of the magnetic field gradient above a thin-film recording head under 3 mA bias current to the head and various tip-head distance conditions are presented. At a low tip-head distance, the gap width, gap location, and gap-field structure can be well resolved in these MFM images. Superparamagnetic tips show promise for the magnetic imaging of recording heads with gap widths below 200 nm.