We found that a huge enhancement of electrical spin accumulation in n-type Ge(001) with the MgO/Co40Fe40B20 (CFB) spin-tunnel contact (STC) is realized by postannealing. The spin-resistance-area product (RsA) of this STC on n-type Ge after postannealing at 350 °C (1.97 ' 106&m2) is nearly one order of magnitude larger than that of the as-deposited one (2.34 ' 105&m2). The dependence of RsA on contact resistance, a scaling property, is also greatly modulated after postannealing. The epitaxial growth of CFB on an MgO(001) template and the consequent TSP improvement are responsible for such changes.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)