Phase behavior of antiferromagnetic ultrathin magnetic films

Abu-Labdeh, A M; Whitehead, J. P.; De’Bell, K; MacIsaac, A. B.

doi:10.1103/physrevb.65.024434

Cited by 18 publications

(32 citation statements)

References 20 publications

(10 reference statements)

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“…23 This has been observed for the z-collinear to xy-plane transition in films. 19,22,30 The results we have obtained from MC simulations also support this conclusion.…”

Section: A the Canted Statesupporting

confidence: 78%

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Phases of anisotropic dipolar antiferromagnets: Mean field theory and Monte Carlo simulations

Fernández

Alonso

2006

Phys. Rev. B

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We study systems of classical magnetic dipoles on simple cubic lattices with dipolar and antiferromagnetic exchange interactions. By analysis and Monte Carlo ͑MC͒ simulations, we find how the antiferromagnetic phases vary with uniaxial and fourfold anisotropy constants ͑C and D respectively͒, as well as with exchange strength J. We pay special attention to the spin reorientation ͑SR͒ phase, and exhibit in detail the nature of its broken symmetries. By mean field theory and by MC, we also obtain the ratio of the higher ordering temperature to the SR transition temperature, and show that it depends mainly on D / C, and rather weakly on J. We find a reverse SR transition.

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“…23 This has been observed for the z-collinear to xy-plane transition in films. 19,22,30 The results we have obtained from MC simulations also support this conclusion.…”

Section: A the Canted Statesupporting

confidence: 78%

“…Accordingly, three component spin models that include exchange as well as dipolar interactions are often used when modeling these effects. 21,22 To explore the transition between the dipolar-and exchange-dominated antiferromagnetic phases is one of the aims of this paper.…”

Section: Introductionmentioning

confidence: 99%

Phases of anisotropic dipolar antiferromagnets: Mean field theory and Monte Carlo simulations

Fernández

Alonso

2006

Phys. Rev. B

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“…3,4,21 Despite the anisotropic character of the dipolar interaction, this ground state is continuously degenerate. 1,22,23 The spin configurations that comprise this ground state manifold are described in terms of a magnetic sublattice consisting of four lattice sites, with the spin at each lattice site oriented as described in Ref.…”

Section: Zero and Finite Temperature Propertiesmentioning

confidence: 99%

“…1,22,23 The spin configurations that comprise this ground state manifold are described in terms of a magnetic sublattice consisting of four lattice sites, with the spin at each lattice site oriented as described in Ref. 3. Each ground state may be characterized in terms of the angle .…”

Section: Zero and Finite Temperature Propertiesmentioning

confidence: 99%

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Effects of a weak magnetic surface anisotropy on the magnetic phase diagram of the dipolar antiferromagnetic Heisenberg system

et al. 2004

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The results of a series of Monte Carlo simulations are presented which examine the effect of a weak magnetic surface anisotropy on the phase behavior of a system of classical three-dimensional spins on a square lattice. In addition to the magnetic surface anisotropy the spins are assumed to interact through a nearest neighbor antiferromagnetic exchange interaction ͑J Ͻ 0͒ and the long range dipolar interaction. The magnetic phase diagram obtained from these simulations is presented for both a negative (planar) and positive (perpendicular) magnetic surface anisotropy constant. In both cases the JT phase diagram exhibits an in-plane dipolar phase for low values of the exchange constant and a perpendicular antiferromagnetic phase for larger values. Both the location and temperature dependence of the phase boundary separating these two phases is shown to be dependent on the sign of the magnetic surface anisotropy constant. In particular the phase boundary is found to monotonically decrease for a negative surface anisotropy and monotonically increase for a positive value. This implies the existence of a thermally induced reorientation transition in which the sequence of states is determined by the sign of the surface anisotropy constant. The results from these simulations are discussed within the context of previous studies on similar systems.

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Order in the ground state of a simple cubic dipole lattice in an external field

Carignano

Madjet

2019

Int J of Quantum Chemistry

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Motivated by the presence of a lattice of rotating molecular dipoles in the high temperature phase of methylammonium lead iodide, we investigate the ground state of a simple cubic lattice of dipoles interacting with each other via the dipole-dipole interaction and with an external field via the standard, linear dipole-field interaction. In the absence of an external field, the ground state is infinitely degenerate, and all the configurations in the ground state manifold are periodic along the three lattice axes with a period of two lattice sites. Using a 1000-dipole lattice as a unit cell in numerical simulations of an infinite simple cubic lattice, we determine the ground state dipole configurations in the presence of an external field. We then analyze the polarization, dipole orientation statistics and correlations in these configurations. Our calculations show that for some special directions of the external field the two-site periodicity in the dipole configurations is preserved, while in the general case this periodicity is lost and complex dipole configurations form under the influence of the external field. More specifically, for a general field direction, a sudden transition from two-site-periodic configurations to irregular configurations occurs at a finite value of the applied field strength.Spin models are ubiquitous in theoretical physics in the study of a variety of physical systems, and they can be used to understand a wide range of phenomena such as ordered states of matter, domain boundaries and phase transitions. [1] Recently, they have also served as natural models to investigate entanglement and related properties in the study of condensed matter systems from the viewpoint of quantum information. [2,3] In the field of light harvesting devices, the recently emerging hybrid organic-inorganic lead-halide perovskites have opened a novel application for spin models, because the organic component often has a net dipole moment. The most representative perovskite material in this area is methylammonium lead iodide (CH 3 NH 3 PbI 3 ), which in its high-temperature phase contains a simple cubic lattice of dipoles from the polar molecule CH 3 NH 3 that occupies the A site in the perovskite crystal structure. [4,5] Spin models have been used to explore the possible origin of hysteresis observed in solar cells, [6,7] to understand the dynamics of cation rotation [8] and to explain the enhancement of carrier conductivity at the interface between domains. [9] More recently, spin models have been used to explore the long-range order in perovskites [10] and the structure of the interface between domains with different ordering patterns across the interface. [11] Spin models apply more generally to other systems in nature, some examples being the ordering of the electric dipoles of water molecules in ice [12] and the dipolar ordering of small molecules trapped in regular cage structures. [13][14][15] Artificially fabricated magnetic superstructures can also

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Phase behavior of antiferromagnetic ultrathin magnetic films

Cited by 18 publications

References 20 publications

Phases of anisotropic dipolar antiferromagnets: Mean field theory and Monte Carlo simulations

Phases of anisotropic dipolar antiferromagnets: Mean field theory and Monte Carlo simulations

Effects of a weak magnetic surface anisotropy on the magnetic phase diagram of the dipolar antiferromagnetic Heisenberg system

Order in the ground state of a simple cubic dipole lattice in an external field

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