Isothermal remanent magnetization and the spin dimensionality of spin glasses

02/2010; DOI: 10.1080/09500839.2010.502140
Source: arXiv

ABSTRACT The isothermal remanent magnetization is used to investigate dynamical magnetic properties of spatially three dimensional spin glasses with different spin dimensionality (Ising, XY, Heisenberg). The isothermal remanent magnetization is recorded vs. temperature after intermittent application of a weak magnetic field at a constant temperature $T_h$. We observe that in the case of the Heisenberg spin glasses, the equilibrated spin structure and the direction of the excess moment are recovered at $T_h$. The isothermal remanent magnetization thus reflects the directional character of the Dzyaloshinsky-Moriya interaction present in Heisenberg systems. Comment: tPHL2e style; 7 page, 3 figures

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    ABSTRACT: Non-equilibrium dynamics in a Ag(Mn) spin glass are investigated by measurements of the temperature dependence of the remanent magnetisation. Using specific cooling protocols before recording the thermo- or isothermal remanent magnetisations on re-heating, it is found that the measured curves effectively disclose non-equilibrium spin glass characteristics such as ageing and memory phenomena as well as an extended validity of the superposition principle for the relaxation. The usefulness of this "simple" dc-method is discussed, as well as its applicability to other disordered magnetic systems. Comment: REVTeX style; 8 pages, 4 figures
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    ABSTRACT: In this paper, we review the general features of the out-of-equilibrium dynamics of spin glasses. We use this example as a guideline for a brief description of glassy dynamics in other disordered systems like structural and polymer glasses, colloids, gels etc. Starting with the simplest experiments, we discuss the scaling laws used to describe the isothermal aging observed in spin glasses after a quench down to the low temperature phase (these scaling laws are the same as established for polymer glasses). We then discuss the rejuvenation and memory effects observed when a spin glass is submitted to temperature variations during aging, and show some examples of similar phenomena in other glassy systems. The rejuvenation and memory effects and their implications are analyzed from the point of view of both energy landscape pictures and of real space pictures. We highlight the fact that both approaches point out the necessity of hierarchical processes involved in aging. We introduce the concept of a slowly growing and strongly temperature dependent dynamical correlation length, which is discussed at the light of a large panel of experiments. Comment: To appear in the proceedings of the summer school "Ageing and the Glass Transition" (University of Luxembourg, sept. 2005), Springer Lecture Notes in Physics
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    ABSTRACT: Isothermal magnetization measurements on a CuMn spin glass show that the memory behaviour of time relaxations in spin glasses is governed by the principle of superposition, which yields fundamental links between the time relaxations of the field-cooled, zero-field-cooled, isothermal-remanent and remanent magnetizations. The principle of superposition applies in spite of a continuous change of the response function at constant temperature, due to aging of the spin glass state.
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