Temperature-dependent magnetic force microscopy investigation of epitaxial MnAs films on GaAs(001)

Plake, T.; Hesjedal, T.; Mohanty, J.; Kästner, M.; Däweritz, L.; Ploog, K. H.
April 2003
Applied Physics Letters;4/7/2003, Vol. 82 Issue 14, p2308
Academic Journal
We present variable-temperature magnetic force microscopy (VT-MFM) studies of epitaxially grown MnAs films on GaAs(001). Around a critical temperature of T[sub c]=40 °C, the MnAs film undergoes a first order structural phase transition. Due to the strain involved, ferromagnetic a-MnAs and paramagnetic β-MnAs phases coexist as stripes along MnAs[0001]. The dimensions of the α-phase change from isolated dots at higher temperatures to well ordered stripes at lower temperatures. VT-MFM allows a close look at the evolution of domain patterns of MnAs micromagnets.


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