Sae Magnetics (h.k.) Limited

Tdk Corporation

Headway Technologies, Incorporated

Eric Cheuk Wing Leung

Noboru Yamanaka

Kosuke Tanaka

Moris Musa Dovek

Yosuke Antoku

David Hu

Rod Lee

Man Tse

Pak Kin Wong

Anthony Wai Yuen Lai

Chris Chiu Ming Leung

Leo Wai Kay Lau

Charles Kin Chiu Wong

Kazuki Sato

Masashi Sano

Takayasu Kanaya

Katsuki Kurihara

Takamitsu Sakamoto

Yoshihiro Kudo

Taro Oike

Soji Koide

Yoshiyuki Mizoguchi

Takayuki Nishizawa

Masaru Iida

Susumu Nagatsuka

Kazumi Nakatogawa

Luke Hung Leung Chung

A magnetic head disposed in a slider, that is arranged at an interval from a magnetic disk includes a sensor disposed in a position that is opposed to the magnetic disk, a heat conductive film that is positioned on an air bearing surface opposed to the magnetic disk, and that is formed so as to overlap the sensor, of which a height in a direction perpendicular to the air bearing surface is more than a height of the sensor, and that transfers a temperature change of the air bearing surface to the sensor, and a pair of lead films electrically connected to the sensor and not electrically connected to the heat conductive film.

Magnetic head including sensor

A slider mounted CPP GMR or TMR read head sensor is protected from electrostatic discharge (ESD) damage and from noise and cross-talk from an adjacent write head by means of a balanced resistive/capacitative shunt. The shunt includes highly resistive interconnections between upper and lower shields of the read head and a grounded slider substrate and a low resistance interconnection between the lower pole piece of the write head and the substrate. The capacitances between the pole piece and the upper shield, the upper shield and the lower shield and the lower shield and the substrate are made equal by either forming the shields and pole piece with equal surface areas and separating them with dielectrics of equal thicknesses, or by keeping the ratio of area to insulator thicknesses equal.

ESD, cross talk and noise minimizing resistive/capacitative shunt for CPP and TMR devices

For obtaining a flying height of a magnetic head from a magnetic disk, the magnetic head being placed in a slider arranged at an interval with the magnetic disk, an initial setting process and a flying height detecting process are performed. In the initial setting process, driving power to a heater is increased gradually, from a state where the heater arranged at a position in proximity to the magnetic head in the slider is not driven, until the magnetic head makes contact with the magnetic disk. Then, in each stage, an electrical resistance value of the sensor arranged at a position in proximity to the magnetic head in the slider, which is increased due to the heat from heater, and either an approach distance of the magnetic head toward the magnetic disk or the flying height of the magnetic head from the magnetic disk are acquired. Then, basic data is prepared by obtaining the relationship between a variation of the electrical resistance value of the sensor and the flying height of the magnetic head from the magnetic disk, which is obtained in each stage or which calculated from the approach distance in each stage. In the flying height detecting process, an electrical resistance value of the sensor is determined, and a variation of the electrical resistance value is calculated from the determined values. Then, the flying height of the magnetic head from the magnetic disk in the state where the electrical resistance value was determined is obtained based on the basic data obtained in the initial setting process, using the calculated variation of the electrical resistance value.

Method of determining flying height of magnetic head

Provided is a magnetic reproducing method that enables a thin-film magnetic head including a head element for reading data signals which has a noise in its output due to a low temperature to bring out an excellent read characteristic in which the noise is suppressed even under the use environment with the low temperature. The magnetic reproducing method comprises the steps of: heating a head element for reading data signals which has a noise in its output due to a low temperature; and performing a read operation by using the head element for reading data signals under condition that the head element is increased in temperature.

Magnetic reproducing method for suppressing low temperature noise

Provided is a method for testing a head element that enables proper evaluation of the head element based on a characteristic of the head element under high-temperature and high-stress conditions. The testing method can be performed on a thin-film magnetic head including a head element and a heating element capable of applying a heat and stress to the head element, or performed on a row bar or a substrate wafer on which a plurality of the head elements and a plurality of the heating elements are disposed. The testing method comprises the steps of: causing the heating element to generate heat to apply a heat and stress to the head element; and measuring a characteristic of the head element under the heat and stress to evaluate the head element.

Testing method of head element and magnetic recording and reproducing apparatus capable of head evaluating

A thin-film magnetic head that the protrusion of the head end surface due to heat generated from the heating means becomes large enough to set the magnetic spacing dto the smaller value efficiently is provided. The head comprises: a substrate having an element-formed surface on which at least one concave portion is formed and an ABS; at least one magnetic head element formed above or on the element-formed surface; at least one thermal expansion layer embedded in the at least one concave portion; and at least one heating means positioned directly above the at least one thermal expansion layer.

Thin-film magnetic head with heating means for adjusting magnetic spacing

Method for protecting a slider mounted CPP GMR or TMR read head sensor from noise and ESD damage

Growing community of inventors

Hong Kong, China

Eric Cheuk Wing Leung