Mesoscopic electrical noise from spins in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Au</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi mathvariant="normal">−</mml:mi><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow>

Ka, Meyer; Mb, Weissman

doi:10.1103/physrevb.51.8221

Cited by 25 publications

(16 citation statements)

References 35 publications

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“…We have found that another transport phenomenon-low-frequency resistance noise from slow dynamics in the spin-glass phase-appears to be found quite generally in conducting spin glasses, so that it offers a promising probe of spin-glass dynamics in single-layer films. [10][11][12] In this article, we demonstrate that noise technique are suit-able for measuring finite-size effects on the spin dynamics near the spin-freezing temperature, T f .…”

Section: Introductionmentioning

confidence: 89%

Resistance noise as a technique for measuring finite-size effects in single-layer Cu_Mn spin-glass films

Fenimore

Weissman

1999

Journal of Applied Physics

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Articles you may be interested inObservation of spin-glass behavior in nickel adsorbed few layer graphene J. Appl. Phys. 113, 024307 (2013); 10.1063/1.4774062Nonlinear magnetization behavior near the spin-glass transition in the layered III-VI diluted magnetic semiconductor Ga 1 − x Mn x S Ag-Mn nanoparticles: Three-dimensional finite size effect of the spin glass stateWe present measurements of the spin-freezing temperature as a function of film thickness in single-layer thin films of Cu គMn and Cu គMnAu. The noise measurements are used to characterize the temperature of the spin freezing in Cu គMn and the cooperativity of the spin dynamics. As expected, the thicker films show cooperative spin dynamics near the spin-glass temperature. The measured spin-glass freezing temperatures as a function of film thickness are consistent with three-dimensional finite-size scaling. This article demonstrates that measurements of the resistance noise are a convenient alternative to magnetic measurements when studying dimensional effects in spin glasses.

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Section: Introductionmentioning

confidence: 89%

Resistance noise as a technique for measuring finite-size effects in single-layer Cu_Mn spin-glass films

Fenimore

Weissman

1999

Journal of Applied Physics

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“…Quite interestingly changes of statistical weights of a few low lying states under magnetic field has been observed [17], which suggests level crossings among low lying excited states due to the variation of the magnetic field. Mesoscopic measurements also appear promising for other glassy systems such as vorticies in super-conductors [18] and polymer glasses [19].…”

Section: Introductionmentioning

confidence: 96%

Stepwise responses in mesoscopic glassy systems: A mean-field approach

Yoshino

Rizzo

2008

Phys. Rev. B

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We study statistical properties of peculiar responses in glassy systems at mesoscopic scales based on a class of mean-field spin-glass models which exhibit 1 step replica symmetry breaking. Under variation of a generic external field, a finite-sized sample of such a system exhibits a series of step wise responses which can be regarded as a finger print of the sample. We study in detail the statistical properties of the step structures based on a low temperature expansion approach and a replica approach. The spacings between the steps vanish in the thermodynamic limit so that arbitrary small but finite variation of the field induce infinitely many level crossings in the thermodynamic limit leading to a static chaos effect which yeilds a self-averaging, smooth macroscopic response. We also note that there is a strong analogy between the problem of step-wise responses in glassy systems at mesoscopic scales and intermittency in turbulent flows due to shocks.

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“…Similar experiments by Meyer and Weissman on AuFe samples reveal deviations from both the droplet model and the hierarchical model for mesoscopic sample sizes. 15 Measurements by de Vegvar et al 16 on mesoscopic CuMn wires with a Mn concentration of 0.1 at. % indicate the presence of a magnetofingerprint that is stable in time.…”

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confidence: 99%

Universal conductance fluctuations and low-temperature1/fnoise in mesoscopic AuFe spin glasses

et al. 2000

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We report on intrinsic time-dependent conductance fluctuations observed in mesoscopic AuFe spin-glass wires. These dynamical fluctuations have a 1/f -like spectrum and appear below the measured spin-glass freezing temperature of our samples. The dependence of the fluctuation amplitude on temperature, magnetic field, voltage, and Fe concentration allows a consistent interpretation in terms of quantum interference effects, that are sensitive to the slowly fluctuating spin configuration.

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Mesoscopic electrical noise from spins inAu1−xFe

Cited by 25 publications

References 35 publications

Resistance noise as a technique for measuring finite-size effects in single-layer Cu_Mn spin-glass films

Resistance noise as a technique for measuring finite-size effects in single-layer Cu_Mn spin-glass films

Stepwise responses in mesoscopic glassy systems: A mean-field approach

Universal conductance fluctuations and low-temperature1/fnoise in mesoscopic AuFe spin glasses

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