Metamagnetism of two-sublattice uniaxial antiferromagnets

Abstract

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'

Molecular Network Approach to Anisotropic Ising Lattices: Parsing Magnetization Dynamics in Er3+ Systems with 0–3-Dimensional Spin Interactivity

“…In dilute spin systems, local dipole fluctuations are limited, which inhibits further nucleation and growth of spin clusters. The spin-flip transition associated with metamagnetism is often described in solid state systems such as DyPO 4 , FeCl 2 , and others, − as well as heavy Fermion systems − occurs in electronic structures where an AFM ground state responds to a small change in applied field to yield a dramatic increase in magnetization to become a spin-polarized FM-type state. The characteristics necessary for metamagnetic spin-flip transitions are strong anisotropy and competing interactions within sublattices. ,− Compounds 1 – 3 are composed of highly anisotropic, Ising-type magnetic units, all of which have distinct crystallographic organizational motifs (Figure ) defining the low-lying magnetic structure.…”

The magnetocaloric effect and spin reorientation transition in single-crystal Er2Fe14Si3

“…Calculations presented in [9,10] have shown that when H ⊥ c-axis FOMP takes place in the domain of the easy-axis anisotropy if…”

“…Therefore the magnetic field should give rise to FOMP in the domain of the easy-axis anisotropy below 116 K but at a temperature a few degrees higher than this only a reversible rotation of the magnetic moment is possible. Provided that H ⊥ c-axis the critical field of the FOMP is given by [9] H…”

“…A number of thermodynamic models of anisotropic magnetic materials have been developed [7][8][9][10]. However, they are typically rather cumbersome and difficult to treat analytically.…”

Phenomenological theory of electromagnetic and sound energy attenuation in many‐domain magnetics

“…For small amplitudes of a sound wave and a t the edges of the OPT region, when walls are still stabilized weakly and have smaller energy [ Z ] , the mechanism of the reversible rotation described in [7] plays the main role. I n the region of a peak the irreversible wall displacement is more essential [9], this determines the peak height. I n the experiment there is a weak dependence of the peak height a(H,) on frequency.…”