We demonstrate slow relaxation of the magnetization in MnAs nanoparticles fabricated from epitaxially grown films on GaAs(001). In disks having a diameter as small as 100nm and a thickness of 50nm, the decay of the magnetization at 27°C, which is merely ∼10°C below the Curie temperature TC, is less than 1% over a period of one day. The large uniaxial magnetocrystalline anisotropy and the abrupt loss of the ferromagnetism at TC of MnAs are responsible for the slow relaxation.
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Takagaki et al. (2006) studied this question.
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