Evaluation of front flux guide-type magnetic tunnel junction heads

K. Shimazawa, O. Redon, N. Kasahara, J. J. Sun, K. Sato, T. Kagami, S. Saruki, T. Umehara, Y. Fujita, S. Yarimizu, S. Araki, H. Morita, M. Matsuzaki

Research output: Contribution to journalConference articlepeer-review

18 Citations (Scopus)


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 term 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.

Original languageEnglish
Pages (from-to)2542-2544
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number5 I
Publication statusPublished - 2000 Sep
Externally publishedYes
Event2000 International Magnetics Conference (INTERMAG 2000) - Toronto, Ont, Canada
Duration: 2000 Apr 92000 Apr 12


  • Front flux guide
  • Magnetic recording/magnetic tunnel junction heads
  • Micromagnetic simulation
  • Shot noise

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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