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Field switching of microfabricated metamagnetic FeRh MRI contrast agents.
Sci Rep
January 2025
Laboratory of Functional and Molecular Imaging, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, 20892, USA.
In a step towards generating switchable MRI cellular labels, we demonstrate in-situ field switching of micron scale metamagnetic Iron-Rhodium (FeRh) thin film particles. A thin-film (200 nm) FeRh sample was fabricated and patterned into an array of progressively smaller squares with sizes ranging from 500 μm down to 1 μm. The large first order phase change from antiferromagnetic to ferromagnetic state was characterized using vibrating sample magnetometry, magnetic force microscopy, and MRI.
View Article and Find Full Text PDFInvestigation of magnetic and transport properties of GdSbSe.
J Phys Condens Matter
January 2025
Department of Chemistry, Indian Institute of Technology Delhi, New Delhi 110016, India.
We report the detailed investigation of the magnetic, transport, and magnetocaloric effects (MCEs) of GdSbSe by magnetic susceptibilityχ(T), isothermal magnetization(), resistivityρ(T,H), and heat capacityCp(T)measurements, crystallizing in the ZrSiS-type tetragonal crystal system with space group P4/nmm. Temperature-dependent magnetic susceptibility measurements revealed long-range antiferromagnetic ordering with two additional magnetic anomalies below Néel temperature (TN≈8.6K), corroborated through magnetocaloric and specific heat studies.
View Article and Find Full Text PDFUnveiling the impact of Ni doping on the structural, electronic, and magnetic properties of nanocrystalline FeCoOspinel oxide: a combined experimental andinvestigations.
J Phys Condens Matter
December 2024
Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India.
Article Synopsis
- The study synthesizes nanocrystalline samples of NixFe1-xCo2O4 at varying nickel concentrations via co-precipitation and annealing at 900 °C, revealing different crystallization phases and decreased particle size with more nickel substitution.
- Magnetic properties were analyzed, showing metamagnetic transitions in certain samples and dynamic susceptibility dependent on both nickel content and temperature, indicating complex magnetic states like spin-glass freezing.
- First principles density functional theory calculates suggest these materials exhibit ferrimagnetic and insulating behaviors, with potential applications in spintronics due to their distinctive electronic structures and spin-dependent characteristics.
Numerical simulation of a two-dimensional Blume-Capel ferromagnet in an oscillating magnetic field with a constant bias.
Phys Rev E
October 2024
PoreLab, NJORD Centre, Department of Physics, University of Oslo, P.O. Box 1048 Blindern, 0316 Oslo, Norway and Department of Physics, Florida State University, Tallahassee, Florida 32306-4350, USA.
We perform a numerical study of the kinetic Blume-Capel (BC) model to find if it exhibits the metamagnetic anomalies previously observed in the kinetic Ising model for supercritical periods [P. Riego et al., Phys.
View Article and Find Full Text PDFDynamic magnetic characteristics of the kinetic Ising model under the influence of randomness.
Phys Rev E
September 2024
School of Science, Shenyang University of Technology, Shenyang 110870, China.
In this paper, we propose to solve the issues of long-range or next-neighbor interactions by introducing randomness. This approach is applied to the square lattice Ising model. The Monte Carlo method with the Metropolis algorithm is utilized to calculate the critical temperature T_{C}^{*} under equilibrium thermodynamic phase transition conditions and to investigate the characterization of randomness in terms of magnetization.
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