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- W2059472020 abstract "In the bulk the structural and magnetic phase transitions between $ensuremath{alpha}$- and $ensuremath{beta}$-MnAs are coupled and proceed abruptly by first order. In heteroepitaxially constrained MnAs/GaAs(001) films, on the other hand, the two phases coexist at $10--40ifmmode^circelsetextdegreefi{}mathrm{C}$ and the magnetization decreases continuously with temperature. We present detailed magnetic measurements on MnAs/GaAs(001) in the phase transition region covering the ferromagnetic $ensuremath{alpha}$ phase, the paramagnetic $ensuremath{beta}$ phase and the $ensuremath{alpha}+ensuremath{beta}$ coexistence region. The coexistence of two magnetically distinguishable types of $ensuremath{alpha}$-MnAs around the onset of the coexistence region at $10ifmmode^circelsetextdegreefi{}mathrm{C},$ the occurrence of metastable magnetic properties, and the absence of a Curie-Weiss peak in the susceptibility point to a first order of the magnetic phase transition also in thin films. The two types of $ensuremath{alpha}$-MnAs are characterized by different coercivity and magnetic anisotropy, the latter due to a change in shape anisotropy of the striped phase." @default.
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- W2059472020 date "2004-02-27" @default.
- W2059472020 modified "2023-09-23" @default.
- W2059472020 title "Nature of the magnetic and structural phase transition inMnAs/GaAs(001)" @default.
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- W2059472020 doi "https://doi.org/10.1103/physrevb.69.081306" @default.
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