Title :
Evaluation of front flux guide-type magnetic tunnel junction heads
Author :
Shimazawa, K. ; Redon, O. ; Kasahara, N. ; Sun, J.J. ; Sato, K. ; Kagami, T. ; Saruki, S. ; Umehara, T. ; Fujita, Y. ; Yarimizu, S. ; Araki, S. ; Morita, H. ; Matsuzaki, M.
Author_Institution :
R&D Dept., TDK Corp., Nagano, Japan
fDate :
9/1/2000 12:00:00 AM
Abstract :
Magnetic tunnel junction (MTJ) heads have been successfully fabricated using the free layer as flux guide to prevent electrical short during the definition of the air bearing surface (ABS). For a 6 Gbits/in2 design, an output as high as 5740 μVpp was achieved for 3 mA sense current, and the output waveform was stable and noise free. Noise analysis confirmed that shot noise is prevailing in these MTJ heads, suggesting that the junction resistance has to be further reduced to challenge spin-valve heads in terms of signal to noise ratio. Landau-Lifshitz-Gilbert simulations showed that for 20 Gbits/in2 application, the flux guide height should not exceed 0.1 μm
Keywords :
magnetic heads; magnetic recording noise; magnetoresistive devices; shot noise; tunnelling; 0.1 micron; 5740 muV; Landau-Lifshitz-Gilbert simulations; air bearing surface; electrical short; flux guide height; front flux guide-type magnetic tunnel junction heads; junction resistance; output waveform; sense current; shot noise; signal to noise ratio; Acoustical engineering; Magnetic field measurement; Magnetic flux; Magnetic heads; Magnetic shielding; Magnetic tunneling; Noise reduction; Signal to noise ratio; Sun; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
