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A new scenario of the mechanism of intriguing ferromagnetic properties inMn-doped magnetic semiconductor (Ga,Mn)As is examined in detail. We find thatmagnetic features seen in zero-field cooled and field cooled magnetizations arenot interpreted with a single domain model [Phys. Rev. Lett. 95, 217204(2005)], and the magnetic relaxation, which is similar to that seen in magneticparticles and granular systems, is becoming significant at temperatures abovethe lower-temperature peak in the temperature dependence of ac susceptibility,supporting the cluster/matrix model reported in our previous work [Phys. Rev.Lett. 94, 147203 (2005)]. Cole-Cole analysis reveals that magnetic interactionsbetween such (Ga,Mn)As clusters are significant at temperatures below thehigher-temperature peak in the temperature dependent ac susceptibility. Themagnetizations of these films disappear above the temperature showing thehigher-temperature peak, which is generally referred to as the Curietemperature. However, we suggest that these combined results are evidence thatthe temperature is actually the blocking temperature of (Ga,Mn)As clusters witha relatively high hole concentration compared to the (Ga,Mn)As matrix.Comment: 8 pages, 7 figures, to appear in Phys. Rev.

physical review. b, condensed matter and materials physics

Dynamic relaxation of magnetic clusters in a ferromagnetic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>(</mml:mo><mml:mi>Ga</mml:mi><mml:mo>,</mml:mo><mml:mi>Mn</mml:mi><mml:mo>)</mml:mo><mml:mi>As</mml:mi></mml:mrow></mml:math>epilayer

Dynamic relaxation of magnetic clusters in a ferromagnetic(Ga,Mn)Asepilayer