I. V. Blinov, M. A. Milyaev, V. V. Popov
BOTTOM SPIN VALVE BASED ON THE ORDERED Ni–Fe–Mn ANTIFERROMAGNETIC PHASE
Magnetic properties of bilayers based on the Ni–Fe–Mn antiferromagnetic phase are studied, as well as magnetic and magnetoresistive properties of a bottom spin valve (SV) with a Ni–Fe–Mn antiferromagnet as a pinning layer. A technique for the fabrication of bottom spin valves with enhanced thermal stability and improved hysteretic characteristics has been developed. Specimens were made by DC magnetron sputtering and electron-beam evaporation on glass (Corning) and single-crystalline sapphire (1012). For the preparation of bottom SV, the specimens were etched in a PlasmaPro NGP 80 RIE Oxford Instruments reactive ion-plasma etching device. The magnetoresistance of the as-fabricated Al2O3/Ni–Fe–Mn/Co90Fe10(5.5 nm)/Cu(3.6 nm)/Co90Fe10(5.5 nm)/Ta(5 nm) spin valve is DR/Rs = 3.8 %.
Acknowledgements: IMP state assignment "Spin" No.01201463330, with partial support by UB RAS (project No. 15-9-2-44) and RFBR (project No. 16-32-00128)
Keywords: unidirectional anisotropy, spin valve, ordered Ni–Fe–Mn antiferromagnetic phase