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Magnetic Hardening: Unveiling Magnetization Dynamics in Soft Magnetic Fe-Ni-B-Nb Thin Films at Cryogenic Temperatures.
Nanomaterials (Basel)
July 2024
Department of Materials Science and Engineering, KTH-The Royal Institute of Technology, Brinellvägen 23, 100 44 Stockholm, Sweden.
Recent advancements in amorphous materials have opened new avenues for exploring unusual magnetic phenomena at the sub-nanometer scale. We investigate the phenomenon of low-temperature "magnetic hardening" in heterogeneous amorphous Fe-Ni-B-Nb thin films, revealing a complex interplay between microstructure and magnetism. Magnetization hysteresis measurements at cryogenic temperatures show a significant increase in coercivity () below 25 K, challenging the conventional Random Anisotropy Model (RAM) in predicting magnetic responses at cryogenic temperatures.
View Article and Find Full Text PDFTemperature-Dependent Phase Evolution in FePt-Based Nanocomposite Multiple-Phased Magnetic Alloys.
Nanomaterials (Basel)
November 2022
Institut des Molécules et Matériaux du Mans, UMR CNRS 6283, Faculté des Sciences & Techniques, Université du Maine Avenue Olivier Messiaen, CEDEX 09, 72085 Le Mans, France.
A quaternary Fe-Pt-Nb-B alloy has been fabricated by the melt spinning method with the purpose of the formation of crystallographically coherent multiple magnetic phases, emerging from the same metastable precursor, as well as to investigate the phase interactions and the influence of their coupling on magnetic performances. For this purpose, extended structural and magnetic investigations were undertaken by making use of X-ray diffraction, transmission electron microscopy, and Fe Mössbauer spectroscopy, as well as magnetic measurements using SQUID magnetometry. It was documented that intermediate metastable phases formed during primary crystallization, in intermediate stages of annealing, and a growth-dominated mode was encountered for the secondary crystallization stage upon annealing at 700 °C and 800 °C where fcc Fe3Pt and fct Fe2B polycrystalline were formed.
View Article and Find Full Text PDFCritical behavior of the three-dimensional random-anisotropy Heisenberg model.
Phys Rev E
September 2022
Institute for Condensed Matter Physics, National Academy of Sciences of Ukraine, UA-79011 Lviv, Ukraine; L^{4} Collaboration and Doctoral College for the Statistical Physics of Complex Systems, Leipzig-Lorraine-Lviv-Coventry, D-04009 Leipzig, Germany; Centre for Fluid and Complex Systems, Coventry University, Coventry, CV1 5FB, United Kingdom; and Complexity Science Hub Vienna, 1080 Vienna, Austria.
We have studied the critical properties of the three-dimensional random anisotropy Heisenberg model by means of numerical simulations using the Parallel Tempering method. We have simulated the model with two different disorder distributions, cubic and isotropic ones, with two different anisotropy strengths for each disorder class. For the case of the anisotropic disorder, we have found evidence of universality by finding critical exponents and universal dimensionless ratios independent of the strength of the disorder.
View Article and Find Full Text PDFDomain state modulation by interfacial diffusion in FePt/FeCo thin films: experimental approach with micromagnetic modelling.
J Phys Condens Matter
June 2021
Department of Physics and Astrophysics, University of Delhi, Delhi-110007, India.
We report the complex implications of inter-diffusion between polycrystalline FePt/FeCo layers as an impact of the FeCo underlayer on the structural and magnetic properties of the system. The crystalline growth of FePt strongly reduces in an entirely diffused system compared to the one with lesser diffusion, while the crystalline structure of FeCo is apparently less affected. Charge redistribution occurs between Fe, Co and Pt ensuring increased Co-Pt and Fe-Pt interactions with higher diffusion.
View Article and Find Full Text PDFCoercivity and Magnetic Anisotropy of (FeSiBP)NbCu Amorphous and Nanocrystalline Alloy Produced by Gas Atomization Process.
Nanomaterials (Basel)
May 2020
Department of Materials Physics, Faculty of Chemistry, University of the Basque Country, P. de Manuel Lardizabal 3, 20018 San Sebastián, Spain.
We present the evolution of magnetic anisotropy obtained from the magnetization curve of (FeSiBP)NbCu amorphous and nanocrystalline alloy produced by a gas atomization process. The material obtained by this process is a powder exhibiting amorphous character in the as-atomized state. Heat treatment at 480 °C provokes structural relaxation, while annealing the powder at 530 °C for 30 and 60 min develops a fine nanocrystalline structure.
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