Intrinsic avalanches and collective phenomena in a Mn(II)-free radical ferrimagnetic chain

Details Intrinsic avalanches and collective phenomena in a Mn(II)-free radical ferrimagnetic chain Intrinsic avalanches and collective phenomena in a Mn(II)-free radical ferrimagnetic chain

2007-10-19

arxiv.org/abs/0710.3707v2

Phys. Rev. B 77, 064416 (2008)

Physics

Condensed Matter

Materials Science

9 pages, 7 fig, to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.77.064416

Magnetic hysteresis loops below 300 mK on single crystals of the Mn(II) - nitronyl nitroxide free radical chain (Mn(hfac)_2({\it R})-3MLNN) present abrupt reversals of the magnetization, or avalanches. We show that, below 200 mK, the avalanches occur at a constant field, independent of the sample and so propose that this avalanche field is an intrinsic property. We compare this field to the energy barrier existing in the sample and conclude that the avalanches are provoked by multiple nucleation of domain-walls along the chains. The different avalanche field observed in the zero field cooled magnetization curves suggests that the avalanche mechanisms are related to the competition between ferromagnetic and antiferromagnetic order in this compound.

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