Patent Number: 7,085,083

Title: Method for testing a micro-actuator in a magnetic tester

Abstract: A system and method for testing the stroke and frequency response of a micro-actuator is disclosed. A dynamic parameter tester writes two concentric tracks on a noise free portion of a magnetic storage medium. A magnetic read/write head and a micro-actuator is positioned between the two concentric tracks. An initial oscillating voltage is applied at a first frequency to the micro-actuator while reading back a signal from the two concentric tracks. A stroke characteristic of the micro-actuator is calculated based in part on the read-back signal. The initial oscillating voltage is determined from previous tests. The first stroke characteristic of the micro-actuator is based on a time-averaged amplitude of the first signal. The two concentric tracks are written at a pre-determined pitch.

Inventors: Zhu; Li-Yan (San Jose, CA), Yang; Chao-Hui (Milpitas, CA), Zhang; Xiaofeng (Fremont, CA), Fu; Yen (San Jose, CA), Cha; Ellis T. (San Ramon, CA)

Assignee: SAE Magnetics (H.K.) Ltd.

International Classification: G11B 27/36 (20060101)

Expiration Date: 8/01/02018