Metamagnetism

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

Experimental Study on Metamagnetism in Ce5Si3.

Abstract: We have measured specific heat in magnetic fields, magnetization at ambient and high pressures and magnetostriction of Ce 5 Si 3 and its alloy system (Ce 1- x La x ) 5 Si 3 . As temperature is lowe...

Magnetic phase transitions in (Fe1−xTx)3Ga4 alloys

Abstract: Magnetisation measurements carried out at high fields in the temperature range 2–900 K using a 12 T magnet revealed the occurrence of field-induced transitions in the series (Fe 1− x Cr x ) 3 Ga 4 with values of x =0.05, 0.10, 0.15, and 0.20. The magnetic phase diagrams produced by Cr substitution are different in nature from those of the parent alloy. Paramagnetic susceptibility data indicate a moment of ∼5 μ B per formula unit compared with the low temperature Fe moment of ∼1.38 μ B indicated by the Mossbauer data. A remarkable feature of the effect of the various substitutions is that there appears to be a relation between the magnetic properties and the relative position of the substitution element with respect to Fe in the periodic table.

Persistence of large magnetodielectric coupling anomalies and multiferroicity for significant dilution of Tb sublattice by Y in Tb2BaNiO5

Abstract: We report temperature dependence of dc magnetization, heat capacity, dielectric, magnetodielectric (MDE) coupling, and pyrocurrent on polycrystalline specimens resulting from a gradual dilution of Tb sublattice by Y in an exotic multiferroic Haldane spin-chain system, Tb2BaNiO5, viz., for the series Tb2−xYxBaNiO5 (x = 0.1, 0.2, 0.5, 1, and 1.5). Among various observations, the ones to be stressed are as follows: (i) The Neel temperature (TN1 = 63 K) and the second magnetic feature occurring at (TN2) 25 K get reduced to lower temperatures with increasing x in a linear fashion, with a concomitant lowering of multiferroicity onset temperature below TN2, scaling essentially with x. This finding emphasizes that local effects due to Tb play a major role on multiferroicity. Clearly, 4f dominates to determine this phenomenon—a rare finding in this field. (ii) The magnitude of the change (Δɛ′) in the dielectric constant surprisingly gets maximized for x = 0.1 with respect to that of the parent compound, attaining a relatively large value of about 22% at 15 K for a field of 100 kOe, thereby revealing that a delicate balance of nonmagnetic doping or defects in favorable cases can enhance MDE coupling. (iii) Nonmonotonic changes in Δɛ′ with a magnetic field, also a changing sign for some compositions, reveal interesting metamagnetodielectric behavior. (iv) The magnetoelectric behavior of x = 1.5 composition is found to be somewhat peculiar with respect to that of other compositions. Thus, this solid solution reveals exotic magneto(di)electric coupling anomalies.