Evaluation of front flux guide-type magnetic tunnel junction heads

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/in/sup 2/ design, an output as high as 5740 /spl mu/Vpp was achieved for 3 mA sense current, and...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2000-09, Vol.36 (5), p.2542-2544
Main Authors: 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.
Format: Article
Language:English
Subjects:
ABS resins
Acoustical engineering
Applied sciences
Design engineering
Electronics
Exact sciences and technology
Flux
Gas bearings
Magnetic devices
Magnetic field measurement
Magnetic flux
Magnetic heads
Magnetic shielding
Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.)
domain-motion devices, etc
Magnetic tunneling
Magnetism
Noise
Noise reduction
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Signal to noise ratio
Simulation
Sun
Temperature
Tunnel junctions
Waveforms
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Summary: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/in/sup 2/ design, an output as high as 5740 /spl mu/Vpp 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/in/sup 2/ application, the flux guide height should not exceed 0.1 /spl mu/m.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.908501