Title :
Current induced noise in CPP spin valves
Author :
Zhu, Jian-Gang ; Kim, Nayoung ; Zhou, Yuchen ; Zheng, Youfeng ; Chang, Jeiwei ; Ju, Kochen ; Zhu, Xiaochun ; White, Robert M.
Author_Institution :
Dept. of Electr. & Comput. Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA
fDate :
7/1/2004 12:00:00 AM
Abstract :
In this paper, an experimental investigation of current-induced noise in current perpendicular-to-plane spin-valve heads is reported. It is found that the sense current yields excitations of coherent spin waves as well as substantial 1/f-like noise when current exceeds a critical value. The noise is magnetic in nature. The criticality and current directional dependence of the noise excitation clearly show that the spin transfer is the cause.
Keywords :
1/f noise; magnetic heads; perpendicular magnetic recording; spin valves; 1/f noise; CPP spin valves; coherent spin waves; current induced noise; current perpendicular-to-plane spin-valve heads; current yields excitations; experimental investigation; magnetic noise; noise excitation; spin transfer; Antiferromagnetic materials; Electrical resistance measurement; Giant magnetoresistance; Magnetic field measurement; Magnetic heads; Magnetic noise; Magnetic tunneling; Magnetization; Noise measurement; Spin valves; $1/f$ noise; CPP; Current perpendicular-to-plane; spin transfer; spin-valve read heads;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2004.829257
