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 effect of the magnetic field on a Ni-Mn-In-Co metamagnetic shape memory has been studied by SQUID magnetometry, and the observed behavior is interpreted in terms of magnetic contribution to the total entropy change associated with the magnetostructural transformation, whose evolution when the field is removed or reduced, follows logarithmic time dependence.
Abstract: The so-called metamagnetic shape memory alloys transform from a ferromagnetic austenite into a weak magnetic martensitic phase, thus the application of a magnetic field, stabilizing the high magnetization phase, can induce the reverse martensitic transformation. Moreover, the martensitic transformation itself becomes arrested as its temperature range is lowered by the application of high enough magnetic fields. In this work the effect of the magnetic field on a Ni-Mn-In-Co metamagnetic shape memory has been studied by SQUID magnetometry. The arrest of the transformation produced by the field results in metastable states, whose evolution when the field is removed or reduced, follows logarithmic time dependence. The observed behavior is interpreted in terms of the magnetic contribution to the total entropy change associated with the magnetostructural transformation.
36 citations
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TL;DR: In the homogeneity range of the Y 2 Ni 17 phase the compounds are weak ferromagnets as mentioned in this paper, and the Stoner criterion is almost fulfilled for some of them.
36 citations
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TL;DR: In this article, the metamagnetic behavior of the low temperature properties of single crystal Co(pyridine)2Cl2 is discussed, and the basic features are consistent with a six-sublattice model for the ordered antiferromagnetic system.
Abstract: The metamagnetic behavior of the low temperature properties of single crystal Co(pyridine)2Cl2 is discussed. At 1.25 K oriented single crystals exhibit a two‐step metamagnetic transition at applied fields ∼0.8 and 1.6 kG along the b‐axis, a single transition at ∼0.7 kG for applied fields along the a* axis, and a single transition at ∼4.2 kG for an applied field along the c axis. Just above the transition fields a moment of 2μB/Co atom is measured for B0 parallel to the a* axis or b axis, and 0.4μB/Co atom is measured for the B0 parallel to the c axis. A large field dependent moment is observed at high fields. Many features of this compound closely mirror the behavior of CoCl2⋅2H2O. However, the Co(pyridine)2Cl2 has a much smaller interchain exchange, so that many features can be examined at lower fields. The basic features are consistent with a six‐sublattice model for the ordered antiferromagnetic system. Measurements of magnetic moment versus temperature show that Co(pyridine)2Cl2 does not obey a Curie–...
36 citations
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TL;DR: In this paper, it was suggested that the leading effect may be a locking of the phase of the modulation of the Ce moments, and the second magnetic transition below TN that occurs at H = 0 in (Ce0.8La0.2)Ru2Si2 and CeRu2(Si0.9Ge0.1)2 single crystals by neutron-scattering experiments, as a function of temperat ure and magnetic field.
Abstract: Long-range magnetic order can be induced in the heavy-fermion compound CeRu2Si2 by slightly expanding the unit-cell volume through alloying (La substituted for Ce, or Ge for Si). The resulting magnetic state has been investigated in (Ce0.8La0.2)Ru2Si2 and CeRu2(Si0.9Ge0.1)2 single crystals by neutron-scattering experiments, as a function of temperat ure and magnetic field. very similar phase diagrams, consisting of various regions with either commensurate or incommensurate modulations of the Ce moments, are obtained for both alloys. The second magnetic transition below TN that occurs at H = 0 in (Ce0.8La0.2)Ru2Si2 appears to be closely related to the persistence of short-range magnetic fluctuations in the ordered state of this material. It is suggested that the leading effect may be a locking of the phase of the modulation.
36 citations
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TL;DR: This work shows that the magnetic behaviors of one-dimensional Ln-nitronyl nitroxide chains can be fine tuned by the substituents of the radicals.
Abstract: The combination of lanthanide ions and nitronyl nitroxide radicals resulted in four new Ln-radical one-dimensional compounds, namely, [Ln(hfac)3{NIT-Ph(OMe)2}]n(LnIII = Sm (1), Eu (2), Gd (3), Dy (4); hfac = hexafluoroacetylacetonate; NIT-Ph(OMe)2 = 2-(2′,4′-dimethoxyphenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-1-oxyl-3-oxide). The four complexes were found to be isomorphous and exhibit nitronyl nitroxide radicals-bridged lanthanides linear chains. DC magnetic susceptibilities show that the directly bonded nitronyl nitroxide interacts ferromagnetically with Gd and Dy ions. The Dy complex exhibits three-step metamagnetism and frequency-dependent ac magnetic susceptibilities, indicating single-chain magnet behavior. This work shows that the magnetic behaviors of one-dimensional Ln-nitronyl nitroxide chains can be fine tuned by the substituents of the radicals.
36 citations