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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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Journal ArticleDOI
TL;DR: A novel 2D coordination polymer consisting of ferromagnetic Ni(ii) chains with alternating double EO-azid bridges and (EO-azide)bis(carboxylate) triple bridges exhibits solvent-modulated metamagnetism and the reversible dehydration/hydration processes are accompanied by significant changes in critical temperature, critical field and hysteresis.

94 citations

Journal ArticleDOI
TL;DR: Taking into account the strong anisotropy of the systems and the interlayer dipolar interactions, the unusual metamagnetic and hysteresis behaviors and the differences between 1 and 2 have been reasonably interpreted.
Abstract: The crystal structures and magnetic properties of two new Co(II) molecular magnets, [Co(N(3))(2)(btzb)] (1) and [Co(N(3))(2)(btze)(2)] (2), are described and discussed (btzb=1,4-bis(tetrazol-1-yl)butane and btze=1,4-bis(tetrazol-1-yl)ethane). In the materials, (4,4) layers with mu-1,3-azide bridges are cross-linked by the monolayered btzb bridging ligands or spaced by bilayered btze terminal ligands to give a 3D (1) or 2D (2) coordination network with significantly different interlayer separations (10.6 vs. 15.2 A). The observation that the layers in 1 and 2 are almost identical have not only allowed us to determine how the interlayer separation imposes its influences on their magnetic behavior, but also helps us understand the complex magnetic behavior of each structure. In the high-temperature range (>25 K), almost identical magnetic behaviors, typical of 2D antiferromagnetic systems, are observed for 1 and 2. At low temperature they exhibit unusual and different behaviors that combine spin canting (weak ferromagnetism), metamagnetism, and stepped hysteresis. It has been found that the interlayer separation has little influence on the ordering temperature (23 vs. 22 K), but imposes very-strong influence on the metamagnetic critical field (6500 vs. 450 Oe), the coercivity (7500 vs. 650 Oe), and the hysteresis-step size. It may also play an adjusting role in determining the canting angle. Taking into account the strong anisotropy of the systems and the interlayer dipolar interactions, we have reasonably interpreted the unusual metamagnetic and hysteresis behaviors and the differences between 1 and 2. In particularly, the stepped hysteresis loops have been explained by two weak ferromagnetic states.

94 citations

Journal ArticleDOI
TL;DR: The magnetic properties and the magnetocaloric effect in TmZn have been studied by magnetization and heat capacity measurements in this paper, and the results indicate that TnZn could be a promising candidate for low temperature and low field magnetic refrigeration.
Abstract: The magnetic properties and the magnetocaloric effect (MCE) in TmZn have been studied by magnetization and heat capacity measurements. The TmZn compound exhibits a ferromagnetic state below a Curie temperature of TC = 8.4 K and processes a field-induced metamagnetic phase transition around and above TC. A giant reversible MCE was observed in TmZn. For a field change of 0–5 T, the maximum values of magnetic entropy change (−ΔSMmax) and adiabatic temperature change (ΔTadmax) are 26.9 J/kg K and 8.6 K, the corresponding values of relative cooling power and refrigerant capacity are 269 and 214 J/kg, respectively. Particularly, the values of −ΔSMmax reach 11.8 and 19.6 J/kg K for a low field change of 0–1 and 0–2 T, respectively. The present results indicate that TmZn could be a promising candidate for low temperature and low field magnetic refrigeration.

94 citations

Journal ArticleDOI
TL;DR: A field-induced insulator-metal (I-M) transition in Pr 0.7 Ca 0.3 MnO 3 has been studied with neutron diffraction experiments and it has been established that an applied field enforces a ferromagnetic spin alignment and drives Pr 1.0 T to a metallic state by actuating the double exchange mechanism and destroying the charge ordering.
Abstract: A field-induced insulator-metal (I-M) transition in Pr 0.7 Ca 0.3 MnO 3 has been studied with neutron diffraction experiments. Over the whole temperature range, the resistivity of Pr 0.7 Ca 0.3 MnO 3 shows insulating behavior at zero field, but exhibits an I-M transition at around 4.0 T at 5 K. It has been established that an applied field enforces a ferromagnetic spin alignment and drives Pr 0.7 Ca 0.3 MnO 3 to a metallic state by actuating the double exchange mechanism and destroying the charge ordering. This I-M transition at 5 K is accompanied with a large hysteresis. By contrast, in the field dependence at 50 K, antiferromagnetic and charge-order components are gradually recovered below 2.0 T in a field-decreasing process. Furthermore, a reentrant I-M-I transition has been observed in the temperature dependence at 2.5 T.

93 citations

Journal ArticleDOI
TL;DR: Inverse and direct magnetocaloric properties were evaluated in preferentially textured Mn50Ni40In10 ribbons applying the magnetic field H∥ along the ribbon length and perpendicular H⊥ to the ribbon plane as discussed by the authors.
Abstract: Inverse and direct magnetocaloric properties were evaluated in preferentially textured Mn50Ni40In10 ribbons applying the magnetic field H∥ along the ribbon length and perpendicular H⊥ to the ribbon plane (ΔH=30 kOe). Maximum magnetic entropy change, hysteretic losses, and refrigerant capacity were not significantly affected by crystallographic texture. Refrigeration capacity around structural transition is strongly reduced by the large hysteretic losses associated to the metamagnetic field-induced reverse martensitic transformation and narrower working temperature range making the interval around the magnetic transition more efficient for a refrigerant cycle (RCstruct=71 J kg−1 versus RCstructeff≈60 J kg−1, and RCmagn=89–86 J kg−1, for H∥ and H⊥, respectively).

93 citations

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202320
202249
202117
202015
201937
201837