Metamagnetism

About: Metamagnetism is a research topic. Over the lifetime, 2023 publications have been published within this topic receiving 38108 citations.

[W(CN)6(L)]1−/2− (L = bidentate ligand) as a useful building unit to construct molecule-based magnetic systems

Abstract: Metal ions heavier than the 3d metals have attracted increasing attention due to their strong magnetic exchange coupling, arising from the diffuse nature of the extended valence orbitals of the 4d and 5d elements and the involvement of a large magnetic anisotropy contingent on their strong spin–orbit coupling. [W(CN)6(L)]1−/2− (L = 2,2′-bipyridine (bpy) and 1,10-phenanthroline (phen)) serves as a suitable building block for constructing molecule-based magnetic systems. Discrete molecular entities and one-dimensional chains are preferably obtained when the restricted paramagnetic precursor [W(CN)6(bpy)]− encounters metal counterparts with the available coordination sites. The bimetallic magnetic assemblies exhibit a variety of magnetic features, along with a magnetostructural correlation. These include slow relaxation of magnetization, typical for single-molecule magnets and single-chain magnets, spin-canting, and metamagnetism. The two-dimensional structure is stabilized by using the reduced [W(CN)6(bpy)]2− complex. In this perspective article, detailed discussions of molecular materials based on the W(V) ion are reviewed.

Antiferro- to ferromagnetic transition and large magnetoresistance in YMn6Sn6−xTix (x=0–1.0) compounds

Abstract: Magnetic and transport properties of YMn6Sn6−xTix (0⩽x⩽1.0) compounds with HfFe6Ge6-type structure were investigated in the temperature range of 5–400 K. The compounds with low Ti content (x⩽0.2) display antiferromagnetic behavior (317 K⩽TN⩽327 K). The Ti-rich compounds (0.8⩽x⩽1.0) behave as ferromagnetic in their whole magnetic ordered range (293 K⩽TN⩽334 K). The intermediate compounds (0.4⩽x⩽0.6) undergo an antiferro- to ferromagnetic transition with increasing temperature. The metamagnetic transition from antiferro- to ferromagnetism can be also induced by an applied field for the antiferromagnetic compounds. The metamagnetic transition field decreases with increasing Ti concentration. The large magnetoresistance of up to 35% is observed at 5 K under 50 kOe for the compounds (0.4⩽x⩽0.6) with metamagnetic behavior. The evolution of the magnetic properties is discussed.

Magnetic and magnetocaloric properties of quasi-one-dimensional Ising spin chain CoV2O6

Abstract: We have investigated the magnetic and magnetocaloric properties of antiferromagnetic Ising spin chain CoV2O6 by magnetization and heat capacity measurements. Both monoclinic α-CoV2O6 and triclinic γ-CoV2O6 exhibit field-induced metamagnetic transitions from antiferromagnetic to ferromagnetic state via an intermediate ferrimagnetic state with 1/3 magnetization plateau. Due to the field-induced metamagnetic transitions, these systems show large conventional as well as inverse magnetocaloric effects. In α-CoV2O6, we observe field-induced complex magnetic phases and multiple magnetization plateaus below 6 K when the field is applied along c axis. Several critical temperatures and fields have been identified from the temperature and field dependence of magnetization, magnetic entropy change, and heat capacity to construct the H–T phase diagram. As compared to α-CoV2O6, γ-CoV2O6 displays a relatively simple magnetic phase diagram. Due to the large magnetic entropy change and adiabatic temperature change at low or moderate applied magnetic field, γ-CoV2O6 may be considered as a magnetic refrigerant in the low-temperature region below 20 K.