Canting of exchange coupling direction in spin valve with various pinned layers

K. Shimazawa, M. Sano, Y. Tsuchiya, N. Kasahara, S. Araki, H. Morita, M. Matsuzaki

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)

Abstract

One of the problems in spin valve (SV) is the thermal stability of exchange coupling between the pinned magnetic layer and the antiferromagnetic (AFM) layer. During operating in actual hard disk drives, the pinned direction tends to cant toward the longitudinal hard magnet direction and as a result, the output voltage drops. In this study we examine the amount of the cant by the heat and field in SV which used different pinned layer material. The sample we used is Ta(5)/NiFe(9)/ Co(1)/Cu(2.7)/pinned layer/AFM/Ta(5) unit nanometers. The pinned layer is three kinds-Co(2), Co(1)/NiFe(1.7), NiFe(3.5), and AFM is two kinds of Ru3Rh15Mn(12 nm), Ru3Rh15Mn(S nm). The pinned-Co-SV has a larger increase of canting degree than the pinned-Co/NiFe-SV and the pinned-NiFe-SV. The longer the SV is exposed to heat and magnetic field, the more the cant increases. It is likely due to the change of the local pinned direction which in turn may be due to the aftereffect in the minute AFM grains during the heating process.

Original languageEnglish
Pages (from-to)4973-4975
Number of pages3
JournalJournal of Applied Physics
Volume85
Issue number8 II A
DOIs
Publication statusPublished - 1999 Apr 15
Externally publishedYes
EventProceedings of the 43rd Annual Conference on Magnetism and Magnetic Materials - Miami, FL, United States
Duration: 1998 Nov 91998 Nov 12

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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