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 %.

Acknowledgment: 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)

References:

1. Ennen I., Kappe D., Rempel T., Glenske C., Hütten A. Giant Magnetoresistance: Basic Concepts, Microstructure, Magnetic Interactions and Applications. Sensors, 2016, vol. 16, no. 6, pp. 904. DOI: 10.3390/s16060904
2. Baibich M.N., Broto J.M., Fert A., Nguyen van Dau F., Petroff F., Etienne P., Creuzet G., Friederich A., Chazelas J. Giant magnetoresistance of (001)Fe/(001)Cr magnetic superlattices. Phys. Rev. Lett., 1988, vol. 61, no. 7, pp. 2472–2475. DOI: 10.1103/PhysRevLett.61.2472 3
3. Coehoorn R. Giant Magnetoresistance and Magnetic Interactions in Exchange-Biased SpinValves. In: K.H.J. Buschow, ed. Handbook of magnetic materials, Elsevier B.V., Amsterdam, 2003, vol. 15, pp. 1–199.
4. Freitas P.P., Ferreira R., Cardoso S., Cardoso F. Magnetoresistive sensors. J. Phys.: Condens. Matt., 2007, vol. 19, no. 16, pp. 165221-1–21. DOI: 10.1088/0953-8984/19/16/165221
5. Ustinov V.V., Milyaev M.A., Naumova L.I., Giant magnetoresistance of metallic exchangecoupled multilayers and spin Valves. Physics of Metals and Metallography, 2017, vol. 118, no. 13, pp. 1300–1359
6. Blinov I.V., Krinitsyna T.P., Korolev A.V., Matveev S.A., Arkhipova N.K., Milyaev M.A., Popov V.V., Ustinov V.V. Formation of Ordered NiFeMn Antiferromagnetic Phase in Permalloy/Manganese Bilayers in the Course of Thermomagnetic Treatment. Physics of Metals and Metallography, 2014, vol. 115, pp. 335–341. DOI: 10.1134/S0031918X14040036
7. Svalov A.V., Vas’kovskii V.O., Yarmoshenko Yu.M. Production and study of spin valve structures on the permalloy film base Fiz. Met. Metalloved., 1995, no. 79, pp. 270–273. (In Russian).

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