Topic
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 study on particle size dependent structural, magnetic and electrical properties of sol-gel derived Bi0.9Ba0.1FeO3 nanoparticles of different sizes ranging from ∼ 12 to 49 nm was performed.
Abstract: Improvement in magnetic and electrical properties of multiferroic BiFeO3 in conjunction with their dependence on particle size is crucial due to its potential applications in multifunctional miniaturized devices. In this investigation, we report a study on particle size dependent structural, magnetic and electrical properties of sol-gel derived Bi0.9Ba0.1FeO3 nanoparticles of different sizes ranging from ∼ 12 to 49 nm. The substitution of Bi by Ba significantly suppresses oxygen vacancies, reduces leakage current density and Fe2+ state. An improvement in both magnetic and electrical properties is observed for 10 % Ba-doped BiFeO3 nanoparticles compared to its undoped counterpart. The saturation magnetization of Bi0.9Ba0.1FeO3 nanoparticles increase with reducing particle size in contrast with a decreasing trend of ferroelectric polarization. Moreover, a first order metamagnetic transition is noticed for ∼ 49 nm Bi0.9Ba0.1FeO3 nanoparticles which disappeared with decreasing particle size. The observed stro...
53 citations
TL;DR: In this article, a metamagnetic transition was found for the magnetic field along the [001] direction at 26 T. The electrical resistivity and magnetic susceptibility are highly anisotropic, reflecting the tetragonal crystal structure.
Abstract: We have grown single crystals of CeRh 2 Si 2 and LaRh 2 Si 2 by the Czochralski pulling method in a tetra-arc furnace. The electrical resistivity and magnetic susceptibility are highly anisotropic, reflecting the tetragonal crystal structure. A metamagnetic transition is found for the magnetic field along the [001] direction at 26 T.
52 citations
TL;DR: In this paper, the Curie temperature of LaFe11.57Si1.43 intermetallic compounds was tuned within the temperature range of 199 K to 346 K by changing the hydrogen content from 0 to 2.3 at.
Abstract: Hydrides of LaFe11.57Si1.43 intermetallic compound have been prepared by high-energy ball milling in the presence of hydrogen gas, a process known as reactive milling. The Curie temperature of the samples was tuned within the temperature range of 199 K to 346 K by changing the hydrogen content from 0 to 2.3 at. % without compromising much of the magnitude of the magnetocaloric effect. Arrott plots and large hysteresis in the magnetization vs magnetic field curves confirm that the first-order itinerant-electron metamagnetic transition is the reason for large entropy change in the parent as well as in the hydride samples. The present study indicates that reactive milling can be an effective method for incorporating interstitial hydrogen within these compounds in order to raise their TC to room temperature.
52 citations
TL;DR: The magnetic behavior of the series of lanthanide-bismuth compounds having the formula LnBi was investigated over a range of temperature extending from 4° to 300°K and at field strengths ranging from 5 to 21 kOe as mentioned in this paper.
Abstract: The magnetic behavior of the series of lanthanide—bismuth compounds having the formula LnBi was investigated over a range of temperature extending from 4° to 300°K and at field strengths ranging from 5 to 21 kOe. Ln represents Ce, Pr, Nd, Sm, Gd, Tb, Dy, and Er. Curie—Weiss behavior was observed in the upper portion of the temperature range covered for all except SmBi. Effective moments were obtained which were in close agreement with that expected from theory for the free tripositive ions. The behavior for SmBi resembles that of elemental Sm and other Sm intermetallics and is attributed to contribution of the first excited multiplet (J=7/2). Antiferromagnetic ordering was observed for all compounds except the Pr and Sm. A Neel point for the latter probably exists but below 4°K. PrBi exhibits only Van Vleck paramagnetism to the lowest temperatures studied. This is ascribed to crystal field splitting which produces a singlet (nonmagnetic) ground state. From the limiting susceptibility an over‐all splitting by the crystal field of 140 cm−1 is estimated. CeBi exhibits metamagnetism with a critical field of about 10 kOe. Its behavior as a metamagnet is atypical and is generally complex in the region where magnetic ordering occurs.
52 citations
TL;DR: In this paper, large magnetocaloric effect (MCE) and magnetoresistance (MR) together with negligible hysteresis loss have been observed in ErNiSi compound, which undergoes metamagnetic transition at low temperatures.
Abstract: Large magnetocaloric effect (MCE) and magnetoresistance (MR) together with negligible hysteresis loss have been observed in ErNiSi compound, which undergoes metamagnetic transition at low temperatures. Magnetization, heat capacity, and resistivity measurements confirm the metamagnetic transition. Both MCE and MR follow H2 dependence in the paramagnetic regime. The maximum value of isothermal entropy change (ΔSM) and MR for a field change of 50 kOe are found to be 19.1 J/kg K and ∼34%, respectively. Large MCE with negligible magnetic hysteresis loss could make this material promising for low temperature magnetic refrigeration.
51 citations