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.
|ジャーナル||Journal of Applied Physics|
|号||8 II A|
|出版ステータス||Published - 1999 4月 15|
|イベント||Proceedings of the 43rd Annual Conference on Magnetism and Magnetic Materials - Miami, FL, United States|
継続期間: 1998 11月 9 → 1998 11月 12
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