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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, a theoretical analysis of the magnetization reversal process in a bi-layer structure with hard and soft (with metamagnetic transition) magnetic layers on an example of an $\mathrm{Fe}Mathrm{Pt}∕\mathrm {Fe}mathrm
Abstract: We present a theoretical analysis of the magnetization reversal process in a bi-layer structure with hard and soft (with metamagnetic transition) magnetic layers on an example of an $\mathrm{Fe}\mathrm{Pt}∕\mathrm{Fe}\mathrm{Rh}$ bi-layer. The latter leads to the formation of a new type of exchange spring which results in a significant reduction of the switching field in the temperature range of the metamagnetic (from antiferromagnetic to ferromagnetic state) transition in an FeRh layer. Analytic expressions for nucleation and switching fields are presented along with results of numerical micromagnetic simulations. The reduction of the switching field due to the metamagnetic transition is controlled by the following microscopic parameters: (i) the interfacial exchange coupling parameter ${J}_{12}$; (ii) saturation magnetization of the FeRh layer in a ferromagnetic phase; (iii) the metamagnetic transition temperature. The switching field dependence on the ${J}_{12}$ parameter is shown to saturate quickly as it approaches the bulk exchange interaction value which has been evaluated using first-principles method used also to verify the electronic nature of the metamagnetic transition. Theoretical results are discussed in the context of recent experimental observations.
65 citations
TL;DR: In this article, the temperature dependence of the Landau coefficients has been derived by fitting the magnetization, M ( μ 0 H ), using the landau expansion of the magnetic free energy.
65 citations
TL;DR: Three novel coordination polymers with azide and a bifunctional zwitterionic ligand bearing carboxylate and tetrazolate as bridging groups, synthesized and characterized by X-ray crystallography and magnetic measurements.
Abstract: Three novel coordination polymers with azide and a bifunctional zwitterionic ligand bearing carboxylate and tetrazolate as bridging groups, [M(L)(N(3))]·xH(2)O [L=1-(carboxylatomethyl)-4-(5-tetrazolato)pyridinium, M=Cu (1, x=2), Ni (2, x=1), and Co (3, x=1)], have been synthesized and characterized by X-ray crystallography and magnetic measurements. The compounds consist of two-dimensional coordination layers in which uniform anionic chains with the unprecedented tricomponent (μ-azide)(μ-tetrazolate)(μ-carboxylate) bridges are cross-linked by cationic 1-methylenepyridinium spacers. The tricomponent bridges induce ferromagnetic interactions in all the compounds. Furthermore, this isostructural series of ferromagnetic-chain-based compounds has allowed us to observe distinct bulk properties that are dependent upon the natures of the different spin carriers: with the isotropic Cu(II) ion, 1 exhibits a paramagnetic phase of the ferromagnetic chains without long-range magnetic order above 2 K; with the weakly anisotropic Ni(II) ions, 2 displays antiferromagnetic ordering and field-induced metamagnetism without slow dynamic relaxation; and with Co(II), which has strong magnetic anisotropy due to first-order spin-orbital coupling, 3 exhibits magnetic hysteresis and slow magnetization dynamics typical of single-chain magnets.
65 citations
TL;DR: In this paper, an irreversible character of ΔTad has been observed in the vicinity of the reverse martensitic transformation in a Ni50Mn36Co1Sn13 metamagnetic shape memory alloy.
Abstract: We have studied adiabatic temperature change ΔTad in a Ni50Mn36Co1Sn13 metamagnetic shape memory alloy. An irreversible character of ΔTad has been observed in the vicinity of the reverse martensitic transformation. In this region, cyclic application of the magnetic field converts comparatively large inverse magnetocaloric effect (MCE) with ΔTadmax=−0.8 K to a weaker conventional MCE (ΔTadmax=0.3 K). The crossover of ΔTad has been attributed to the irreversible character of the magnetic field-induced transformation and the closeness of the martensitic transformation and Curie temperature of the austenitic phase TCA.
64 citations
TL;DR: In this paper, the magnetic susceptibility of the new B 12 icosahedral higher boride compound TbB 50 was measured and a large change in behavior around 17 K was observed, indicating the existence of an antiferromagnetic-like transition at high fields.
Abstract: Static magnetic susceptibility of the new B 12 icosahedral higher boride compound TbB 50 was measured and a large change in behavior around 17 K was observed, indicating the existence of an antiferromagnetic-like transition At high fields a metamagnetic transition was observed to occur and the magnetic phase diagram was determined This is the first report of a magnetic transition being observed in the higher boride compounds An interesting feature of this behavior is that it is in contrast to the typical Curie-Weiss behavior of the more terbium rich compound TbB 25 and also the more boron rich compound TbB 66 which were also synthesized and measured in this work This is considered to be an aspect of the unique structure of the REB 50 (RE=rare-earth) compounds recently discovered
63 citations