Metamagnetism

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

Full magnetization process of 3d−4f hard magnetic materials in ultrahigh magnetic fields (an example: RFe11Ti)

Abstract: The prospects of using the free-powder high-field magnetization method for a quantitative study of inter-sublattice exchange interaction in 3d−4f hard magnetic materials are analyzed. Such analysis is stimulated by the availability of pulsed magnetic fields ∼103 T generated by implosion. Particular attention is paid to effects due to magnetic anisotropy, essential for these materials. The 3d−4f ferrimagnets where both sublattices contribute positively to the easy-axis anisotropy are shown to be suitable objects of study by the free-powder method, because (i) anomalies in their low-temperature magnetizatization curves are sharp and (ii) anisotropic effects can be allowed for without quantitative knowledge of the anisotropy constants. Moreover, these “good” hard magnetic materials can be brought into metamagnetic regime by diluting the rare earth sublattice with nonmagnetic yttrium; then, regardless of the anisotropy constants, the magnetization curve at low temperatures has just one steplike anomaly, the threshold field being equal exactly to the molecular field acting on the rare earth.

Metamagnetic transition and magnetothermal properties of ErCo4Ge2

Abstract: Polycrystalline ErCo4Ge2 was investigated by magnetic susceptibility and heat capacity measurements The results show that ErCo4Ge2 undergoes a transition from the paramagnetic to the antiferromagnetic (AFM) state around 26 K The second order character of this magnetic transition is confirmed from the lambda-like peak of the heat capacity data Both χ′ and χ″ of ErCo4Ge2 are strongly dependent on the ac magnetic field frequency and bias dc magnetic field A field induced metamagnetic transition from AFM to ferromagnetic state is observed below TN Under a magnetic field change of 50 kOe, the maximum value of the magnetic entropy change (magnetocaloric effect) −ΔSM is 142 J/kg K at 275 K and the adiabatic temperature change ΔTad is 57 K In particular, a large −ΔSM value of 117 J/kg K is achieved for a low magnetic field change of 20 kOe

Finite Temperature Study of the Itinerant Metamagnetic Transition in Y(Co1-xAlx)2

Abstract: Isothermal magnetizations of itinerant metamagnet Y(Co 1- x Al x ) 2 , x =0.08∼0.11, were measured in static fields up to 23 T at various temperatures 3.6∼30 K. Temperature variation of the magnetization M is found to change dramatically around the metamagnetic field H c , from ∂ M /∂ T >0 ( H H c , gradual decrease of γ continues to higher fields. These results suggest that the spin fluctuation behavior of this system is strongly affected by the metamagnetic transition.

Anomalous metamagnetic process of TbCo2Ge2 single crystal

Abstract: Measurements of the high field magnetization up to 14 T and the magnetic susceptibility have been carried out on a single crystal of the tetragonal antiferromagnetic TbCo2Ge2 (TN = 32 K). In spite of a large uniaxial anisotropy and a simple antiferromagnetic structure with the propagation vector (0,0,1), the c-axis magnetization shows anomalous metamagnetic processes, with three or four smooth transitions at low temperatures.

Metamagnetic behavior and effect of pressure on the electronic state in heavy-fermion compound YbRh2Zn20

Abstract: We measured the magnetic susceptibility, high-field magnetization, magnetoresistance, specific heat, and Hall coefficient, together with the electrical resistivity under high pressures and magnetic fields, for the heavy-fermion compound YbRh2Zn20 with the cubic CeCr2Al20-type structure. The metamagnetic behavior was observed at Hm = 65 kOe for the magnetic field along the direction below Tχmax = 5.3 K, at which the temperature of the magnetic susceptibility indicates a broad maximum. The coefficient A of the T2 dependence of electrical resistivity ρ=ρ0 + AT2 and the electronic specific heat coefficient C/T possess a broad maximum at Hm. The metamagnetic field Hm is found to decrease with increasing pressure and to become zero at a critical pressure Pc ≃5.2 GPa. Correspondingly, the A value increases drastically in magnitude, and the Fermi liquid relation is no longer satisfied at 5.2 GPa in zero magnetic field, implying a non-Fermi liquid state. On the other hand, at magnetic fields of H > 20 kOe, t...