Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/physrevb.54.10001 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Size dependence of the surface spin disorder and surface anisotropy constant in ferrite nanoparticles.
Nanoscale Adv
August 2023
Department of Inorganic Chemistry, Faculty of Science, Charles University Hlavova 2030/8 128 43 Prague 2 Czech Republic
The magnetic properties of nanoscale magnets are greatly influenced by surface anisotropy. So far, its quantification is based on the examination of the blocking temperature shift within a series of nanoparticles of varying sizes. In this scenario, the surface anisotropy is assumed to be a particle size-independent quantity.
View Article and Find Full Text PDFMultiscale magnetization in cobalt-doped ferrite nanocubes.
J Appl Crystallogr
December 2022
Department of Chemistry, Universität zu Köln, Köln, Germany.
The magnetization of cobalt ferrite nanocubes of similar size, but with varying Co/Fe ratio, is extensively characterized on atomistic and nanoscopic length scales. Combination of X-ray diffraction, Mössbauer spectroscopy, magnetization measurements and polarized small-angle neutron scattering (SANS) reveals that a lower amount of cobalt leads to an enhanced magnetization. At the same time, magnetic SANS confirms no or negligible near-surface spin disorder in these highly crystalline, homogeneously magnetized nanoparticles, resulting in an exceptionally hard magnetic material with high coercivity.
View Article and Find Full Text PDFControlling inversion disorder in a stoichiometric spinel magnet.
Proc Natl Acad Sci U S A
October 2022
Okinawa Institute of Science and Technology Graduate University, Onna, Okinawa 904-0495, Japan.
In the study of frustrated quantum magnets, it is essential to be able to control the nature and degree of site disorder during the growth process, as many measurement techniques are incapable of distinguishing between site disorder and frustration-induced spin disorder. Pyrochlore-structured spinel oxides can serve as model systems of geometrically frustrated three-dimensional quantum magnets; however, the nature of the magnetism in one well-studied spinel, ZnFeO, remains unclear. Here, we demonstrate simultaneous control of both stoichiometry and inversion disorder in the growth of ZnFeO single crystals, directly yielding a revised understanding of both the collective spin behavior and lattice symmetry.
View Article and Find Full Text PDFMagnetic nanoprecipitates and interfacial spin disorder in zero-field-annealed NiMnIn Heusler alloys as seen by magnetic small-angle neutron scattering.
J Appl Crystallogr
August 2022
Department of Physics and Materials Science, Université du Luxembourg, 162A avenue de la Faïencerie, Luxembourg L-1511, Grand Duchy of Luxembourg.
Shell ferromagnetism is a new functional property of certain off-stoichiometric Ni-Mn-In Heusler alloys, with a potential application in non-volatile magnetic memories and recording media. One key challenge in this field remains the determination of the structural and magnetic properties of the nanoprecipitates that are the result of an annealing-induced segregation process. Thanks to its unique mesoscopic length scale sensitivity, magnetic small-angle neutron scattering appears to be a powerful technique to disclose the microstructure of such annealing-induced nanoprecipitates.
View Article and Find Full Text PDFDamping of dipole-exchange spin waves in ferromagnetic thin films at elevated temperatures.
J Phys Condens Matter
June 2021
Department of Physics and Astronomy, University of Western Ontario, London, Ontario, N6A 3K7, Canada.
A non-bosonic technique, based on the drone-fermion perturbation method and a high-density expansion, is employed to study the spin-wave (SW) scattering processes in a ferromagnetic thin film with exchange and dipole-dipole interactions. Specifically, the diagrammatic contributions to the spin-spin Green's functions are evaluated within a 1/perturbation expansion, whereis the number of spins interacting with any given spin. The results are used to calculate the SW damping at temperatures below the Curie temperature.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!