Monte Carlo study of magnetic order at ferromagnetic and antiferromagnetic surfaces: Implications for spin-polarized photoelectron diffraction

Zhang, F.; Thevuthasan, S.; Scalettar, Richard; Singh, Rajiv R. P.; Fadley, C. S.

doi:10.1103/physrevb.51.12468

Cited by 18 publications

(8 citation statements)

References 31 publications

(28 reference statements)

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“…Beyond the special point, r > r c , the critical exponents at the surface transition, T s > T c , are believed to be in the universality class of the two-dimensional Ising model [1,2]. Indeed, our Monte Carlo data are consistent with that prediction.-At this point, we draw attention to recent Monte Carlo simulations on short-range correlation functions near the surface transition, T s , which have been performed to interpret spin-polarized photoelectron data of some magnets [15].…”

supporting

confidence: 82%

Critical phenomena at perfect and non-perfect surfaces

Pleimling

Selke

1998

Eur. Phys. J. B

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The effect of imperfections on surface critical properties is studied for Ising models with nearest-neighbour ferromagnetic couplings on simple cubic lattices. In particular, results of Monte Carlo simulations for flat, perfect surfaces are compared to those for flat surfaces with random, 'weak' or 'strong', interactions between neighbouring spins in the surface layer, and for surfaces with steps of monoatomic height. Surface critical exponents at the ordinary transition, in particular $\beta_1 = 0.80 \pm 0.01$, are found to be robust against these perturbations.Comment: 7 pages, 13 figures, submitted to European Physical Journal

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supporting

confidence: 82%

Critical phenomena at perfect and non-perfect surfaces

Pleimling

Selke

1998

Eur. Phys. J. B

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“…In the experiment of spin-polarized photoelectron diffraction, on the other hand, the information on spins in a few layers from the surface is provided. Our experimental result supports the Monte Carlo study on simple-cubic Ising lattices, 49 where the observed abrupt change in the photoelectron spectrum was suggested to be due to a surface-specific magnetic transition.…”

Section: Discussionsupporting

confidence: 89%

Optically induced magnetization and ultrafast spin relaxation in manganese oxide

et al. 2008

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The optically induced magnetization and ultrafast spin relaxation in an antiferromagnet MnO were observed by polarization spectroscopy with the pump-probe technique. The spin relaxation time in the picosecond region was measured at temperatures from 6 up to 800 K. The observed spin relaxation is the sum of the spin-spin relaxation and the spin-lattice relaxation. At lower temperatures below room temperature, the temperatureindependent spin-spin relaxation is dominant. A stepped decrease in the spin relaxation rate was observed near the Néel temperature T N = 118 K, where the long-range order is lost. At higher temperatures above room temperature, the temperature-dependent spin-lattice relaxation is dominant. The observed spin-lattice relaxation rate has a T 2 dependence instead of the T 9 dependence well known in magnetic-resonance measurements for the Raman process of phonons. The observed temperature dependence can be explained by the conventional theory of spin-lattice relaxation for the Raman process by taking account of the effect of the Debye temperature of the crystal.

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“…This manifests itself as an enhancement of magnetism at the boundaries (i x = 0 and i x = n − 1) which is especially evident in the nearneighbor correlation at U = 4. Such enhancement is known to occur in a variety of materials, and can be ascribed either to the reduced coordination at the surface and the associated lowering of quantum fluctuations (as is the case here), or to the presence of modified exchange constants due to surface relaxation or reconstruction [35].…”

Section: Results-local Spin Correlationsmentioning

confidence: 79%

Interaction-induced gradients across a confined fermion lattice

Batrouni

Scalettar

2017

Phys. Rev. A

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An imposed chemical potential gradient A ↑ = dµ ↑ /dx on a single fermionic species ("spin up") directly produces a gradient in the density dρ ↑ /dx across a lattice. We study here the induced density inhomogeneity dρ ↓ /dx in the second fermionic species ("spin down") which results from fermionic interactions U , even in the absence of a chemical potential gradient A ↓ = 0 on that species. The magnitude of dρ ↓ /dx acquired by the second species grows with U , while the magnitude of dρ ↑ /dx remains relatively constant, that is, set only by A ↑ . For a given A ↑ , we find an interaction strength U * above which the two density gradients are equal in magnitude. We also evaluate the spin-spin correlations and show that, as expected, antiferromagnetism is most dominant at locations where the local density is half-filled. The spin polarization induced by sufficiently large gradients, in combination with U , drives ferromagnetic behavior. In the case of repulsive interactions, dρ ↓ /dx = −dρ ↑ /dx. A simple particle-hole transformation determines the related effect in the case of attractive interactions.

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Monte Carlo study of magnetic order at ferromagnetic and antiferromagnetic surfaces: Implications for spin-polarized photoelectron diffraction

Cited by 18 publications

References 31 publications

Critical phenomena at perfect and non-perfect surfaces

Critical phenomena at perfect and non-perfect surfaces

Optically induced magnetization and ultrafast spin relaxation in manganese oxide

Interaction-induced gradients across a confined fermion lattice

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