Samsung Electronics Co., Ltd.

Sooyoul Hong

Hyung Jai Lee

SungChang Lee

Joe Bragg

Taekdong Lee

Daehoon Hong

A servo writer that writes servo information onto a disk of a hard disk drive. The writing of the servo can be synchronized by a clock track that contains a clock read back signal. The clock read back signal is differentiated by a differentiator circuit. A clamping circuit clamps the clock read back signal to minimize signal ringing, undershoot and overshoot phenomena in the signal.

Apparatus and method to minimize amplitude variations associated with media/head response characteristics in servo writing of perpendicular magnetic recording

Slider used to access data on rotating disk in hard disk drive, including heating element as vertical micro-actuator coupled to deformation region including read-write head and to expansion chamber, plate thermally coupled to heat sink. Slider further includes vertical control signal stimulating heating element coupled to film to alter vertical position, and expansion chamber, plate, and heat sink minimizing thermal pole tip protrusion. Flexure finger including micro-actuator assembly for coupling to slider, and possibly providing vertical control signal to heating element. Head gimbal assembly including flexure finger coupled to the slider. A head stack assembly including at least one of the head gimbal assemblies coupled to a head stack. Hard disk drive including head stack assembly. The invention includes manufacturing the slider, the head gimbal assembly, the head stack assembly, and the hard disk drive, as well as these items as products of the invention's manufacturing processes.

Apparatus and method for preventing excessive thermal pole tip protrusion in slider of a hard disk drive

A disk for a hard disk drive. The disk includes a S1 layer of magnetic material located over a substrate, and a layer of ruthenium located over the S1 layer. The disk further includes a top layer of magnetic material and a layer of chromium located adjacent to the top magnetic layer. The chromium diffuses into the top layer of magnetic material to magnetically decouple the grains of the magnetic material. Decoupling the grains of the magnetic material reduces the magnetic noise of the disk and improves the signal to noise ratio of the hard disk drive.

Antiferromagnetically coupled (AFC) media with flash CR interlayer between top magnetic layer and S2 magnetic layer

A disk for a hard disk drive. The disk includes a first layer of magnetic material located over a substrate, an intermediate layer located over the first magnetic layer and a second layer of magnetic material located over the intermediate layer. The second layer may include cobalt and chromium. The intermediate layer may include titanium. The first magnetic layer include iron, hafnium and nitrogen (FeHfN). This composition of the first magnetic layer shows higher saturation magnetization and lower roughness, and increases the nucleation field of the disk.

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Santa Clara, CA, United States of America

Sooyoul Hong