Extra current channels in longitudinally biased magnetic tunnel junctions

O. Redon, N. Kasahara, K. Shimazawa, S. Araki, H. Morita, M. Matsuzaki

Research output: Contribution to journalConference articlepeer-review

9 Citations (Scopus)

Abstract

Experiments on the longitudinal biasing of microsized magnetic tunnel junctions have been conducted using permanent magnets partially overlapping the junction area. The tunneling magnetoresistance ratio showed a strong dependency on the overlap length, since even a 10% overlap of the sensor length resulted in a 25% drop from its initial value without overlap. Analytical and micromagnetic analyses have demonstrated that this decrease comes from extra current channels, located in the regions below the permanent magnets, that shorted a large amount of the sense current from the central active region in the antiparallel magnetization state. The high uniaxial anisotropy field, induced by the permanent magnets in the overlapped regions, created particular magnetic configurations responsible for these low resistance paths. Several alternatives, using antiferromagnetic material in place of the permanent magnets or a modified design of the magnetic tunnel junction structure, are presented and discussed to prevent this extra current channel effect.

Original languageEnglish
Pages (from-to)4688-4690
Number of pages3
JournalJournal of Applied Physics
Volume87
Issue number9 II
DOIs
Publication statusPublished - 2000 May
Externally publishedYes
Event44th Annual Conference on Magnetism and Magnetic Materials - San Jose, CA, United States
Duration: 1999 Nov 151999 Nov 18

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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