Didier Hérisson, Michael Östh and Per Nordblad Uppsala University

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Presentation transcript:

Didier Hérisson, Michael Östh and Per Nordblad Uppsala University Experimental first order reversal curves (FORC) on Ising and Heisenberg spin glasses Didier Hérisson, Michael Östh and Per Nordblad Uppsala University

Hysteresis loops on spin glasses Au(Fe) – E.I. Kondorski et al. (1973) Cu(Mn)-P. Monod et al. (1979) (From Spin Glasses, R. Rammal and J. Souletie, notes from a course at Grenoble in 1981)

What can one learn from the hysteresis behaviour using FORCs? The FORC distribution gives a visualisation of switching events Comparison with ’related’ systems Distinguishes an in-field SG phase from no in-field SG phase?

The FORC method Roberts et al. J. Geophys. Res. 105, 28461 (2000)

Construction of the FORC distribution

FORC distributions C.R. Pike et al. Geophys. J. Int. 145, 721 (2001) b) Weakly interacting nanoparticles c) Floppy disc. d) nanoparticles

Monte Carlo 2d-EASG H. G. Katzgraber et al. Phys. Rev. Lett. 85, 257202 (2002)

3D FORC distribution plot from MC-simulations of a 2d Ising EASG H.G. Katzgraber et al.

ZFC-FC-TRM H=0.1 Oe Ag(Mn) FMTO

Hysteresis of Ag(Mn) and Fe0.5Mn0.5TiO3

FORC FMTO M (arb.units.)

FORC distribution FMTO

FORCs Ag(Mn)

FORC distribution Ag(Mn)

3D FORC Ag(Mn)

Comparison FMTO Ag(Mn)

Conclusions Remarkably different hysteresis behaviour for Ising (strongly anisotropic) and Heisenberg spin glasses. The FORCs of FMTO shows similarities with weakly interacting nanoparticle systems with wide distributions of particle sizes. The Ag(Mn) system yields unique FORC distributions with a very sharp structure at a rather weak negative bias field and low coercivity…… Supportive of other experimental indications suggesting in-field SG transitions in weakly anisotropic systems?

FeAgW – mechanically alloyed

FeAgW - FORC FeAgW c.f. FMTO