| Autor: |
V. S. Speriosu, A. Van der Heijden, T.K. Chin, H.-R. Blank, S. Jaren, A.M. Zeltser, K. Pentek, Yanfei Zhang, J. P. Nozières, S. Trotter, T. Tuchscherer |
| Rok vydání: |
2000 |
| Předmět: |
|
| Zdroj: |
IEEE Transactions on Magnetics. 36:586-590 |
| ISSN: |
0018-9464 |
| Popis: |
The thermal stability of NiMn-based spin valves was studied both at the coupon level and in full read/write heads. In the coupons, the blocking temperature distribution showed no component below 150/spl deg/C. As a result, the exchange field at elevated temperature was found to increase with time (because of improved chemical ordering of the NiMn layer), and irreversible losses in the /spl Delta/R/R response were observed only above 250/spl deg/C (because of layer interdiffusion). If a 10% drop in /spl Delta/R/R amplitude is used as a criterion to calculate time to failure, the NiMn heads should have several hundred years of lifetime at 150/spl deg/C operating temperature. Full read/write heads showed linear response with read-back amplitudes above 2 mV//spl mu/m at 6-mA operating current. In contrast to most other giant magnetoresistance heads, the output of the head remains the same after heating with a high bias current and degrades only with the shorting of the stripe. All these properties make NiMn superior to other antiferromagnets for spin valve head applications. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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