Topic
Metamagnetism
About: Metamagnetism is a research topic. Over the lifetime, 2023 publications have been published within this topic receiving 38108 citations.
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TL;DR: In this paper, the electronic origin of metamagnetism in strongly anisotropic antiferromagnets is examined and the infinite-dimensional Hubbard model with easy axis is investigated both analytically and numerically.
Abstract: The electronic origin of metamagnetism in strongly anisotropic antiferromagnets is examined. To this end the infinite-dimensional Hubbard model with easy axis is investigated both analytically and numerically. At weak coupling a first order transition and at strong coupling a second order phase transition is found. To determine the transition behavior at intermediate coupling Quantum Monte Carlo techniques are used to calculate the field versus temperature phase diagram. The apparent similarities to the phase diagram of FeBr2 and to mean field results for the Ising model with competing interactions are discussed.
6 citations
TL;DR: In this paper, the authors studied the relation between room-temperature photo-magnetic effect and by-products in composite films and found that metamagnetic Fe3Ga4 compound is most likely meta-stable bi-product and may play a principle role for RT-PEM.
Abstract: [(GaAs) m
(Fe)
n
]
p
composite films on GaAs(001) substrates obtained by molecular beam deposition methods at T
s = 580°C have been thermally annealed, and magnetic/structural changes caused by the annealing have been measured to study the relation between room-temperature photo-magnetic effect and by-products in composite films. Annealing inhomogeneous [(GaAs)8(Fe)5]20 film, prepared by alternate beam deposition of Fe and GaAs, results in an increase in saturation magnetization, whereas the room-temperature photo-enhanced magnetization (RT-PEM) vanishes. Metamagnetic Fe3Ga4 is suppressed with the formation of ferromagnetic Fe3Ga2−x
As
x
. Observed results suggest two important points: firstly, metamagnetic Fe3Ga4 compound is most likely meta-stable bi-product and may play a principle role for RT-PEM, and secondly, ferromagnetic Fe3GaAs and its derivatives are the stable form in Ga-As-Fe ternary system.
6 citations
TL;DR: In this article, a phase diagram for DyPO4 is presented for a two-sublattice Ising antiferromagnet with moments along the crystallographic c-axis.
Abstract: DyPO4 orders below 3.39 K as a two-sublattice Ising antiferromagnet with its moments along the crystallographic c-axis. Measurements of the specific heat and the magnetocaloric effect with the magnetic field applied along c are performed to determine the phase diagram. A new intermediate ferrimagnetic phase is found at the metamagnetic transition from the antiferromagnetic to the paramagnetic state below 0.82 K. Although this phase extends only over a field range of about 20 mT, it is clearly seen since for crystals with finite demagnetising factor it produces additional mixed phases at the first-order phase boundary. The measured phase diagram is verified by mean-field calculations and the possibility of even more ferrimagnetic phases is discussed.
6 citations
TL;DR: The (NH4)2[ReF6] (1) salt was studied by X-ray diffraction, Raman spectroscopy, theoretical calculations, and magnetic measurements.
Abstract: The (NH4)2[ReF6] (1) salt was studied by X-ray diffraction, Raman spectroscopy, theoretical calculations, and magnetic measurements 1 crystallizes in the trigonal space group Pm1 (Re–F = 1958(5) A) In the Raman spectrum of 1, splitting of the observed peaks was observed and correlated to the valence frequencies of vibration of the [ReF6]2− anion The study of the magnetic properties of 1, through DC and AC magnetic susceptibility measurements, reveals the coexistence of metamagnetism and slow relaxation of magnetization at low temperature, which is unusual in the molecular systems based on the paramagnetic 5d metal ions reported so far
6 citations
TL;DR: In this paper, the magnetization of the UCo 1− x T x Al (T=Fe, Ni) single crystals as a function of magnetic field (0 − 9 T), temperature (1.5 − 40 K), and external pressure (0 - 1.2 GPa) was studied.
6 citations