Monte Carlo simulations of intragrain spin effects in a quasi-2D Heisenberg model with uniaxial anisotropy

LeBlanc, Martin; Whitehead, J. P.; Plumer, M. L.

doi:10.1088/0953-8984/25/19/196004

Cited by 5 publications

(5 citation statements)

References 26 publications

(39 reference statements)

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“…9 and 10 and suggest that the high-T shoulder may be attributed to surface term in the Hamiltonian. This is analogous to the Schottky anomaly [28] observed in simulations performed at large K values in bulk IrMn3 11 . Figure 11 shows the transition temperature for both three and six layer cases as a function of D estimated from the peaks in the specific heat.…”

Section: Monte Carlo Simulationssupporting

confidence: 80%

Section: Monte Carlo Simulationssupporting

confidence: 80%

“…It is shown that for the six layer case that the presence of the surface anisotropy leads to a relatively small change in the value of T N from its 3D value. This is in contrast with the three layer case where T N vs D exhibits a maximum near D = 0.7 with = T 0.3 N before decreasing to a nearly constant value of ≈ T 0.15 N for D greater than about 4 (Note that for the case of ferromagnetically exchange coupled spins, T N increases monotonically with increasing D [29].). In addition, the magnetic structure of the interior layers is qualitatively similar to the q = 0 spin structure of the bulk material described in [11], while the spins at the surface layers have a component normal to the (1 1 1) plane and order ferrimagnetically.…”

Section: Discussionmentioning

confidence: 59%

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Monte Carlo simulations of ABC stacked kagome lattice films

Yerzhakov¹,

Plumer²,

Whitehead³

2016

J. Phys.: Condens. Matter

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Properties of films of geometrically frustrated ABC stacked antiferromagnetic kagome layers are examined using Metropolis Monte Carlo simulations. The impact of having an easy-axis anisotropy on the surface layers and cubic anisotropy in the interior layers is explored. The spin structure at the surface is shown to be different from that of the bulk 3D fcc system, where surface axial anisotropy tends to align spins along the surface [1 1 1] normal axis. This alignment then propagates only weakly to the interior layers through exchange coupling. Results are shown for the specific heat, magnetization and sub-lattice order parameters for both surface and interior spins in three and six layer films as a function of increasing axial surface anisotropy. Relevance to the exchange bias phenomenon in IrMn3 films is discussed.

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Section: Monte Carlo Simulationssupporting

confidence: 80%

Section: Monte Carlo Simulationssupporting

confidence: 80%

Section: Discussionmentioning

confidence: 59%

See 1 more Smart Citation

Monte Carlo simulations of ABC stacked kagome lattice films

Yerzhakov¹,

Plumer²,

Whitehead³

2016

J. Phys.: Condens. Matter

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“…In our classical Monte Carlo simulations, the Metropolis algorithm [61] and a variant of the Wolff cluster algorithm [62], modified for inclusion of the anisotropic exchange interactions [63] and the single-ion anisotropy [64], were used to update spins during simulations. For each measurement, one Metropolis sweep of the entire spin lattice and 10 Wolff cluster updates were done.…”

Section: Appendix E: Calculations Details: Classical Monte Carlo Simu...mentioning

confidence: 99%

Magnetic anisotropy and magnetic ordering of transition-metal phosphorus trisulfides

Kim,

Park

2021

Preprint

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Here, a magnetic model with an unprecedentedly large number of parameters was determined from firstprinciples calculations for transition-metal phosphorus trisulfides (TMPS 3 's), which reproduced the measured magnetic ground states of bulk TMPS 3 's. Our Monte Carlo simulations for the critical temperature, magnetic susceptibility, and specific heat of bulk and few-layer TMPS 3 's agree well with available experimental data and show that the antiferromagnetic order of FePS 3 and NiPS 3 persists down to monolayers. Remarkably, the orbital polarization, which was neglected in recent first-principles studies, dramatically enhances the magnetic anisotropy of FePS 3 by almost two orders of magnitude. A recent Raman study [K. Kim et al., Nat. Commun. 10, 345 (2019)] claimed that magnetic ordering is absent in monolayer NiPS 3 but simultaneously reported a strong two-magnon continuum; we show that the criterion used to judge magnetic ordering there is invalid in monolayer NiPS 3 , thus providing an understanding of the two seemingly contradictory experimental results. The rich predictions on the magnetic susceptibility and specific heat of few-layer FePS 3 and NiPS 3 await immediate experimental verifications.

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“…The simulation techniques used in this work have omitted effects due to thermally induced fluctuations in the magnitude of the grain moments as have been modeled previously through an atomistic approach 7,[17][18][19] or via the Landau-Lifshitz-Bloch (LLB) equations. 20,21 At the slower KMC time scales, it is unlikely the higher-energy fast dynamics associated with the strong inter-atomic exchange interactions will be important.…”

Section: Temperature Dependence Of Mh Loopsmentioning

confidence: 99%

Simulations of magnetic hysteresis loops at high temperatures

Plumer

Whitehead

et al. 2014

Journal of Applied Physics

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Articles you may be interested inEffects of grain microstructure on magnetic properties in FePtAg-C media for heat assisted magnetic recording Magnetic and structural properties of hexagonal-close-packed-CoCrPt-C granular media for high areal density recordingThe kinetic Monte-Carlo algorithm as well as standard micromagnetics are used to simulate MH loops of high anisotropy magnetic recording media at both short and long time scales over a wide range of temperatures relevant to heat-assisted magnetic recording. Microscopic parameters, common to both methods, were determined by fitting to experimental data on single-layer FePt-based media that uses the Magneto-Optic Kerr effect with a slow sweep rate of 700 Oe/s. Saturation moment, uniaxial anisotropy, and exchange constants are given an intrinsic temperature dependence based on published atomistic simulations of FePt grains with an effective Curie temperature of 680 K. Our results show good agreement between micromagnetics and kinetic Monte Carlo results over a wide range of sweep rates. Loops at the slow experimental sweep rates are found to become more square-shaped, with an increasing slope, as temperature increases from 300 K. These effects also occur at higher sweep rates, typical of recording speeds, but are much less pronounced. These results demonstrate the need for accurate determination of intrinsic thermal properties of future recording media as input to micromagnetic models as well as the sensitivity of the switching behavior of thin magnetic films to applied field sweep rates at higher temperatures. V C 2014 AIP Publishing LLC. [http://dx.

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Monte Carlo simulations of intragrain spin effects in a quasi-2D Heisenberg model with uniaxial anisotropy

Cited by 5 publications

References 26 publications

Monte Carlo simulations of ABC stacked kagome lattice films

Monte Carlo simulations of ABC stacked kagome lattice films

Magnetic anisotropy and magnetic ordering of transition-metal phosphorus trisulfides

Simulations of magnetic hysteresis loops at high temperatures

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