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Direct magnetic writing of ferromagnetic nanoscale elements provides an alternative pathway for potential application in data storage or spintronic devices. Magnetic patterning due to local chemical disordering of FeAl thin films results in adjacent nanoscale regions that possess two different phases, a low-magnetization and high-coercive chemically ordered phase (non-irradiated ferromagnetic area, NIFM) and a high-magnetization and low-coercive chemically disordered phase (irradiated ferromagnetic area, IMF). Depending on the volume of NIFM and IFM phases, different interaction mechanisms were revealed.
View Article and Find Full Text PDFCoexistence of multiple magnetic interactions in oxygen-deficient V2O5 nanoparticles.
J Phys Condens Matter
September 2024
School of Physics, Indian Institute of Science Education Research Thiruvananthapuram, Maruthamala PO, Vithura, Trivandrum, Kerala, 695551, INDIA.
This paper reports on the spin glass-like coexistence of competing magnetic orders in oxygen-deficient V2O5 nanoparticles with a broad size distribution. X-ray photoelectron spectroscopy yields the surface chemical stoichiometry of nearly V2O4.65 due to significant defect density.
View Article and Find Full Text PDFQ-voter model with independence on signed random graphs: Homogeneous approximations.
Phys Rev E
January 2024
Faculty of Physics, Warsaw University of Technology, Koszykowa 75, PL-00-662 Warsaw, Poland.
The q-voter model with independence is generalized to signed random graphs and studied by means of Monte Carlo simulations and theoretically using the mean-field approximation and different forms of the pair approximation. In the signed network with quenched disorder, positive and negative signs associated randomly with the links correspond to reinforcing and antagonistic interactions, promoting, respectively, the same or opposite orientations of two-state spins representing agents' opinions; otherwise, the opinions are called mismatched. With probability 1-p, the agents change their opinions if the opinions of all members of a randomly selected q neighborhood are mismatched, and with probability p, they choose an opinion randomly.
View Article and Find Full Text PDFLow-temperature cluster spin glass transition in the single-domain NiCrOnanoparticles.
Nanotechnology
February 2024
Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501, Japan.
NiCrOnanoparticles with average particle size ∼15 nm, a single-domain size maintains the bulk canted antiferromagnetic ground state, were synthesized by a microwave combustion method. The magnetic behavior was carefully investigated by static and dynamic magnetic susceptibility measurements. In addition to a spin-glass-like behavior below paramagnetic-ferrimagnetic transition at, the NiCrOnanoparticles demonstrate a low-temperature cluster spin glass transition below the spin canting transition, which manifests itself as a magnetic anomaly peak around ∼12 K (at 100 Oe) in the zero-field cooled magnetization with a relatively stronger field dependence in a 'de Almeida-Thouless' line for spin glasses.
View Article and Find Full Text PDFReentrant canonical spin-glass dynamics and tunable field-induced transitions in (GeMn)CoOKagomé lattice.
J Phys Condens Matter
November 2023
Department of Physics, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.
We report on the reentrant canonical semi spin-glass characteristics and controllable field-induced transitions in distorted Kagomé symmetry of (GeMn)CoO. This-site spinel exhibits complicated, yet interesting magnetic behaviour in which the longitudinal ferrimagnetic (FiM) order sets in below the Néel temperature∼ 77 K due to uneven moments of divalent Co (↑ 5.33) and tetravalent Mn (↓ 3.
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