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artículo con referato
"Anisotropic magnetic-field-induced phase transition in MnAs nanoribbons"
F. Fernandez Baldis, Martín Sirena, Laura B. Steren, V.H. Etgens, M. Eddrief, C. Ulysse and G. Faini
Appl. Phys. Lett. 107(1) (2015) 012407/1-5
MnAs thin films present a phase coexistence of regularly arranged ferromagnetic (α) and paramagnetic (β) stripes below the Curie temperature when grown onto GaAs(100) substrates. In this letter, we report the observation of a magneto-structural phase transition induced by magnetic field on MnAs nanoribbons below the Curie temperature. A transformation of high-resistance paramagnetic regions into low-resistance ferromagnetic ones is observed above temperature-dependent critical magnetic fields. The phenomenon is hysteretic, highly anisotropic, and size dependent and could be the origin of the high magneto-resistance effect observed at temperatures close to room temperature in these systems.
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