arxiv: 1111.6435 · v2 · pith:CL74LKB7new · submitted 2011-11-28 · ❄️ cond-mat.mtrl-sci

Structural and magnetic dynamics of a laser induced phase transition in FeRh

S. O. Mariager , F. Pressacco , G. Ingold , E. Mancini , A. Caviezel , E. M\"ohr-Vorobeva , P. Beaud , S. L. Johnson

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C. J. Milne S. Moyerman E. Fullerton R. Feidenhans'l C. H. Back C. Quitmann

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classification ❄️ cond-mat.mtrl-sci

keywords magneticphasestructuraltransitiondiffractiondynamicsferhferromagnetic

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We use time-resolved x-ray diffraction and magnetic optical Kerr effect to study the laser induced antiferromagnetic to ferromagnetic phase transition in FeRh. The structural response is given by the nucleation of independent ferromagnetic domains (\tau_1 ~ 30ps). This is significantly faster than the magnetic response (\tau_2 ~ 60ps) given by the subsequent domain realignment. X-ray diffraction shows that the two phases co-exist on short time-scales and that the phase transition is limited by the speed of sound. A nucleation model describing both the structural and magnetic dynamics is presented.

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Structural and magnetic dynamics of a laser induced phase transition in FeRh

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