Strain imaging of a perpendicular recording head in a Hard Disk Drive

被引:3
作者
Takata, K. [1 ]
Kurata, N. [1 ]
Tamura, S. [1 ]
Shingubara, S. [1 ]
Nakahara, S. [1 ]
Tagawa, N. [1 ]
Arai, Y. [1 ]
机构
[1] Kansai Univ, Fac Engn Sci, Dept Mech Engn, Osaka 5648680, Japan
关键词
Strain imaging; Scanning probe microscopy; Hard disk drive; Magnetic-field-induced strain; MAGNETIC FORCE MICROSCOPY; FIELD; DYNAMICS;
D O I
10.1016/j.jmmm.2009.10.030
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Imaging of magnetic-field-induced strains using scanning probe microscopy enables us to observe magnetic domain structures and magnetic force distributions. This method has an ability of observing magneticstructures in deep portions along with surface structures. We observed an air-bearing surface of a perpendicular recording head in a hard disk drive in large areas including the whole yokes, and investigated characteristics of the magnetic poles and layers subjected to magnetic fields produced by writing coil currents. Attractive forces independent of the field directions acted between the upper and lower yokes made by soft material, which generated surface displacements in the ABS. The signals were second-harmonic oscillations for alternating currents without a dc bias, and the amplitude images represented the field distribution. Meanwhile,fixed magnetic charges in both ends of the read sensor, which were produced by the hard-bias film, were subjected to the fields. The fixed charges, which hardly changed by the fields, lead to strains depending on the field directions, and generated specific contrasts of one pair of bright-dark spots in the strain images. In the absence of surface underlayer, the fields by the writing coil broke in to the read sensor sandwiched by the shield layers. (C) 2009 Elsevier B. V. All rights reserved.
引用
收藏
页码:638 / 642
页数:5
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