Title :
Experimental Measurements of Spin Torque Driven Spin Wavesw in Tunneling MR Heads
Author :
Zhu, J. ; Zhou, Y.
Author_Institution :
Carnegie Mellon Univ., Pittsburgh
Abstract :
Microwave oscillation induced by polarized spin current via the effect of spin momentum transfer, also known as spin torque, has been observed in current-perpendicular-to-plane spin valve structures. It has been found that in the spin valve stack, a relatively large sensing current can drive magnetization oscillation into chaotic spin waves, resulting in substantial 1/f-like noise below 1 GHz. In this paper, we present a experimental study of the spin torque, induced microwave oscillation in tunneling magnetoresistive (TMR) read heads used in hard disk drive applications.
Keywords :
1/f noise; disc drives; magnetic heads; magnetisation; spin valves; spin waves; tunnelling magnetoresistance; 1/f-like noise; hard disk drive; magnetization oscillation; microwave oscillation; polarized spin current; spin momentum transfer; spin torque driven; spin valve; spin waves; tunneling MR heads; tunneling magnetoresistive read heads; Current measurement; Electrical resistance measurement; Frequency; Magnetic field measurement; Magnetic heads; Magnetization; Performance evaluation; Spin valves; Torque measurement; Tunneling magnetoresistance;
Conference_Titel :
Magnetics Conference, 2006. INTERMAG 2006. IEEE International
Conference_Location :
San Diego, CA
Print_ISBN :
1-4244-1479-2
DOI :
10.1109/INTMAG.2006.375858
