Abstract
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[1¯100] and MnAs[1¯1¯20] directions, respectively, and exhibits weak ferromagnetism with a Tc exceeding 400 K. These experimental observations indicate that the magnetic characteristics of MnAs are strongly correlated to the material’s crystal structure.
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