Tdk Corporation

Sae Magnetics (h.k.) Limited

Mitsuo Otsuki

Koji Shimazawa

Daisuke Miyauchi

Shinji Hara

Norikazu Ota

Masaru Hirose

Yuji Ito

Tsutomu Chou

Tetsuya Roppongi

Naoto Matono

Hiroshi Kiyono

Norio Takahashi

Katsuki Kurihara

Yoshihiro Kudo

Hiroki Matsukuma

Yoshikazu Sawada

Anthony Wai Yuen Lai

Shoji Toyoda

Nobutaka Nishio

Osamu Nakada

Eijii Komura

While a plurality of drive currents for flying height setting with current values smaller than a tentative optimum drive current are supplied to a light source, respectively, heater power is supplied to a heater part, and touch down of a thermally-assisted magnetic recording head is detected. Tentative optimum heater power is determined based on a correlation between the heater power when the touch down is detected and each drive current for flying height setting. The tentative optimum drive current is supplied to the light source part; the tentative optimum heater power is supplied to the heater part; a reference signal is recorded in a magnetic recording medium; and flying height of the thermally-assisted magnetic recording head is set by determining whether or not the reference signal is recorded with the desired signal intensity.

Method of setting flying height and flying height setting device

The thermally-assisted magnetic recording head includes: a magnetic pole having an end exposed on an air-bearing surface; a waveguide; a plasmon generator provided between the magnetic pole and the waveguide, and having a first region and a second region, the first region extending backward from the air-bearing surface to a first position, and the second region being coupled with the first region at the first position and extending backward from the first position; a gap layer provided between the magnetic pole and the first region of the plasmon generator and extending backward from the air-bearing surface to the first position, and being formed of a dielectric material; and a metallic layer buried in the gap layer, and extending forward from a second position that is located between the air-bearing surface and the first position.

Thermally-assisted magnetic recording head having gap layers between magnetic pole and plasmon generator

Provided is a smear-removing method that can remove smear of a manufactured thin-film magnetic head. The method is performed to a thin-film magnetic head including an MR effect element for reading data having two electrode layers sandwiching an MR effect multilayer as a magneto-sensitive portion therebetween. The method comprises the step of applying a stress voltage less than a breaking voltage of the MR effect element between the two electrode layers to burn off smear. In the method, it is preferable that the stress voltage is applied while an electric resistance or an output voltage of the MR effect element is measured, and the stress voltage is increased until the value of the electric resistance or the output voltage reaches an upper limit specified value specified from a value of an electric resistance or an output voltage in a normal case where smear is not present.

Method for removing smear and magnetic recording/reproducing apparatus with function of removing smear

A head support mechanism includes a suspension for supporting a magnetic head slider with a thin-film magnetic head, having a slider mounting section on which the magnetic head slider is fixed, and a heating unit formed on the slider mounting section of the suspension. The heating unit is capable of producing heat.

Head support mechanism, magnetic head assembly, and magnetic disk drive apparatus

Provided is a thin film magnetic head capable of reducing the amount of protrusion of a write shield layer, thereby preventing a collision with a recording medium, and thereby ensuring a recording operation with stability. A heat sink layer is disposed on the leading side of a thin film coil in order to dissipate heat produced by the thin film coil. When the thin film coil produces heat during the recording of information, priority is given to the guidance of the heat to the leading side of the thin film coil, namely, the side opposite to the position of the write shield layer, rather than the guidance of the heat to the trailing side of the thin film coil, namely, the position of the write shield layer, so as to dissipate the heat. Thus, the thin film magnetic head reduces the likelihood of the heat accumulating in the write shield layer, thus reduces the likelihood of the write shield layer expanding thermally, and thus reduces the amount of protrusion of the write shield layer.

Thin film magnetic head and magnetic recording apparatus with partitioned heat sink layer

The invention is directed to a magnetic head driving circuit and a magnetic disk device which achieve a low flying-height with thermal protrusion and thus a reliable write operation on the magnetic disk. The write circuitreceives the write data signal Sw inputted therein, and generates and outputs the write voltages Wx, Wy based upon the inputted signal. The write voltages Wx, Wy are composed of a preamble portion T, a sink mark Tand a user data portion Tin each sector for magnetic recording. In the write voltage, the frequency f2 of the signal in the preamble portion Tis higher than half the frequency f1 of the signal in the user data portion T

Magnetic head driving circuit and magnetic disk device

Growing community of inventors

Tokyo, Japan

Mitsuo Otsuki