Effect of strain on the local phase transition temperature of MnAs/GaAs(001)

Mohanty, J.; Hesjedal, T.; Ney, A.; Takagaki, Y.; Koch, R.; Däweritz, L.; Ploog, K.H.
October 2003
Applied Physics Letters;10/6/2003, Vol. 83 Issue 14, p2829
Academic Journal
We present measurements of the influence of local strain on the phase transition behavior of epitaxial MnAs films on GaAs(001). As shown previously, stripes of ferromagnetic α-MnAs and paramagnetic β-MnAs coexist around room temperature. Temperature-dependent atomic force and magnetic force microscopy reveals that the characteristic temperature T[sup *], at which the as-grown films transform to the paramagnetic β-phase, is locally shifted up towards the value of unstrained bulk MnAs. The film areas exhibiting a higher T[sup *] were identified as regions in which the strain in the MnAs film was allowed to relax. © 2003 American Institute of Physics.


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