Title :
A study of voltage fluctuation, noise and magnetic instability in spin valve GMR recording heads
Author_Institution :
Quantum Corp., Milpitas, CA, USA
fDate :
7/1/1998 12:00:00 AM
Abstract :
An abnormal voltage fluctuation in spin valve GMR recording heads is reported. Methodologies for detecting the fluctuation using a spin stand or an MR transfer curve tester are presented and used to study the phenomenon as a function of bias current and magnetic field. It is shown that the fluctuation only occurs within narrow ranges of sensor bias current, is suppressed by an external magnetic field and can result in a 7 dB increase in the noise floor at 10 MHz. Low field transfer curves show that the voltage fluctuation is the result of magnetic instability
Keywords :
fluctuations; giant magnetoresistance; magnetic heads; magnetic multilayers; magnetic recording noise; magnetoresistive devices; 10 MHz; 7 dB; MR transfer curve tester; abnormal voltage fluctuation; bias current; external magnetic field; low field transfer curves; magnetic field; magnetic instability; noise; sensor bias current; spin stand; spin valve GMR recording heads; voltage fluctuation; Giant magnetoresistance; Magnetic anisotropy; Magnetic heads; Magnetic noise; Magnetic recording; Magnetic sensors; Perpendicular magnetic anisotropy; Spin valves; Testing; Voltage fluctuations;
Journal_Title :
Magnetics, IEEE Transactions on
