On the theory of metamagnet transitions

Mitsek, A. I.

doi:10.1002/pssb.2220590131

Cited by 7 publications

(6 citation statements)

References 11 publications

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“…Thus we see that the phase transition is of the first type. Noting thatwe may conclude that the transition, as in the previous case, occurs by moving of the metamagnetic walls [26]. When defects are introduced in the crystal the phase transition is field spread [24].…”

mentioning

confidence: 99%

3d-4f METALLIC COMPOUNDS.Magnetic moment, magnetic anisotropy and spin-reorientation phase transition in (4f-3d)-intermetallic compounds

Deryagin¹

1979

J. Phys. Colloques

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confidence: 99%

3d-4f METALLIC COMPOUNDS.Magnetic moment, magnetic anisotropy and spin-reorientation phase transition in (4f-3d)-intermetallic compounds

Deryagin¹

1979

J. Phys. Colloques

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“…The presence of a domain structure can change the character of remagnetization of the uniaxial metaniagnet for the transition from the AFM state to the F M one as considered in the previous section. This was discussed in [4]. The appearance of the F M phase nucleus is possible inside the domain wall of the AFM phase due to the existence of a field for which thermodynamic potentials are equal.…”

Section: Domain Structure In the Metastable State Regionmentioning

confidence: 99%

“…For explaining the hysteresis in the field parallel to the a-axis and the small remanent magnetization it is necessary to take into account the fourth-order anisotropy constant because Gd3Co and (Gdo.zTbo,8)3Co have orthorhombic symmetry. The presence of the fourth-order anisotropy constant can ensure the reorientation of the field to the a-axis by the first-order phase transition [4]. We shall consider an orthorhombic metamagnet in future.…”

Section: Comparison With Experimentsmentioning

confidence: 99%

“…MPD and domain structures of metamagnets with two and three compensated and uncompensated sublattices are considered in [4], the magnetostatic energy being not taken into account. A review of properties of metamagnetic materials is given in [5], the main peculiarity of metamagnets is a big jump of the magnetization in the region of the metamagnetic OPT of first-order type.…”

Section: Introductionmentioning

confidence: 99%

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Metamagnetism of two-sublattice uniaxial antiferromagnets

Mitsek

Kolmakova

Sirota

1981

Phys. Stat. Sol. (a)

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Magnetic phase diagrams, magnetization curves, and domain structures of a uniaxial two-sublattice metamagnet are considered taking into account the magnetostatic energy. The problem of nucleation for a metamagnetic phase transition of the first-order type is investigated. The results are compared with available experimental data. PaCCMOTpeHbI MarHHTHbIe $a30BbIe HIlarPaMMbI, KPHBbIe HaMarHHUXBaHHH H HOMeHHbIe CTPYKTYPbI OAHOOCHOrO HByXIIO~pelIIeTOrHOrO MeTaMarHeTHKa IlpH YreTe MWHHTO-CTaTElseCKOH 3HeprMH. HCCJIeJXYeTCZI npo6ne~a 3apO~bI~eO6pa30BaHHH IIpll MeTaMarHHT-HOM @BOBOM IlepeXOHe nepBOr0 pojla. Pe3YJIbTaTbI CpaBHHBaWTCH C Ei MeIoLUHMHCH 3KCIIePHMeHTaJIbHbIMH AaHHbIMH. FeCI, -2 H,O [El, in Gd,Al[13], in rare-earth metals [14], in Gd,Co and (Gd0,2Tb0,8)3Co [15], in Ca,Mn,Ge,O,, [16]. The felaxation of magnetization near OPT is connected apparently with the metamagnetic domain structure [ 171. The metamagnetic OPT are discovered in non-collinear CoNb,O, [18], in four-sublattice PbFeC1, -2 D,O, and CsFeC1, 2 D,O, [19], in rare-earth metal alloys [ZO]. The influence of the concentration z on the metamagnetism of the solution Fe~,-,,Co,Cl, is measured in [21].The authors of a recent experimental study [16] try to interpret the results using the model of a n isotropic metamagnet [22]. However, the agreement with the theory is not complete as the authors of [16] note. I n the present paper we attempt to show that it is possible to explain the available experimental material in the frame of the 33'

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“…Most theoretical studies in this field are restricted to the investigations of Stoner-Wohlfarth processes through coherent switching [34] in models with uniaxial and cubic anisotropies [35,36,37,38,39,40,41]. Such theories describe magnetization reversal in a limiting case of ideally hard magnetic materials.…”

Section: Introductionmentioning

confidence: 99%

Phenomenological theory of magnetization reversal in nanosystems with competing anisotropies

Leonov

Rößler

Bogdanov

2008

Journal of Applied Physics

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The interplay between intrinsic and surface/interface-induced magnetic anisotropies strongly influences magnetization processes in nanomagnetic systems. We develop a micromagnetic theory to describe the field-driven reorientation in nanomagnets with cubic and uniaxial anisotropies. Spin configurations in competing phases and parameters of accompanying multidomain states are calculated as functions of the applied field and the magnetic anisotropies. The constructed magnetic phase diagrams allow to classify different types of the magnetization reversal and to provide detailed analysis of the switching processes in magnetic nanostructures. The calculated magnetization profiles of isolated domain walls show that the equilibrium parameters of such walls are extremely sensitive to applied magnetic field and values of the competing anisotropies and can vary in a broad range. For nanolayers with perpendicular anisotropy the geometrical parameters of stripe domains have been calculated as functions of a bias field. The results are applied to analyse the magnetization processes as observed in various nanosystems with competing anisotropies, mainly, in diluted magnetic semiconductor films (Ga,Mn)As. 75.50.Ee,

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On the theory of metamagnet transitions

Cited by 7 publications

References 11 publications

3d-4f METALLIC COMPOUNDS.Magnetic moment, magnetic anisotropy and spin-reorientation phase transition in (4f-3d)-intermetallic compounds

3d-4f METALLIC COMPOUNDS.Magnetic moment, magnetic anisotropy and spin-reorientation phase transition in (4f-3d)-intermetallic compounds

Metamagnetism of two-sublattice uniaxial antiferromagnets

Phenomenological theory of magnetization reversal in nanosystems with competing anisotropies

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