Sae Magnetics (h.k.) Limited

Headway Technologies, Incorporated

Wah Chun Chan

Koji Shimazawa

Takashi Honda

Kowang Liu

Ryo Hosoi

Juren Ding

Dayu Zhou

Makoto Kawato

Wai Bun Ow

Ho Kei Lam

Cheuk Man Lui

Kai Chiu Cheung

Yuk Sing Lo

A light source unit for thermally-assisted magnetic head includes a substrate member having a bonding surface, multiple layers formed on the bonding surface and comprising a base layer, a connection pad layer, an insulation layer and a bonding layer; a light source assembly attached on the bonding layer of the substrate member and having a laser diode embedded therein and connected to the connection pad layer on the bonding surface, so as to form a laser diode circuit; and a heater buried in the insulation layer and connected to the connection pad layer, so as to form a heater circuit. The light source unit can maintain stable heat power for facilitating performance of the thermally-assisted magnetic head, and further reduce the sizes of the light source unit and substrate member.

Semiconductor laser for thermally-assisted magnetic recording head

A method for evaluating bit error rate for a magnetic head by using a quasi-static test system, includes step (a), measuring a noise characteristic curve for a magnetic head, and the noise characteristic comprising noise amplitude and maximum noise amplitude; step (b), constructing a noise waveform by appropriately scaling a signal noise ratio of the magnetic head based on the noise characteristic curve measured in step (a); and step (c), injecting the noise waveform constructed in step (b) into a model comprising a transmitter module and a receiver module to evaluate a bit error rate. The method saves testing time, reduces manpower, and obtains accuracy testing result.

Method for evaluating bit error rate for a magnetic head by using a quasi-static test system, and system thereof

Growing community of inventors

Hong Kong, China

Wah Chun Chan