Thermostability of Spin-valve Type Functional Elements Based on Co, Cu and Ru

Abstract

The paper presents the results of studying the ways of thermostabilization of performance characteristics of functional metal spin-valve type nanostructures based on Co and Cu. It is shown that the use multilayers instead of one of the magnetic Co layers and Ru layer leads to increase in magnetoresistance value of nanosystems and its stabilization after annealing the samples in the range $300 \div 900\ \mathcal{K}$. It has been shown that an effective spin-valve can be a system [Co (3) / Cu (3)]18/ Cu (8) / Co (20) / Ru (10) / S (S - substrate) for which the magnetoresistance value at room temperature measurement reaches 0,8 % which remained stable during the subsequent annealing to 900 K. An increase in the magnetoresistance of this spin-valve up to 1.2 % can be achieved for nanosystems [Co (3) / Cu (3)]18/ Cu (8) / Co (20) / S.