We grew heteroepitaxial type-A MnAs thin films on GaAs(001) and Si(001) substrates and compared their crystal structures and magnetic properties. The type-A MnAs on the GaAs(001) substrate shows similar structural and magnetic properties as those in bulk form. However, the structure of the type-A MnAs on the Si(001) substrate is compressed and stretched along the MnAs 1̄100 and MnAs 1̄1̄ 20 directions, respectively, and exhibits weak ferromagnetism with a T c exceeding 400 K. These experimental observations indicate that the magnetic characteristics of MnAs are strongly correlated to the material's crystal structure.
ASJC Scopus subject areas
- Physics and Astronomy(all)