365 citations · 1.5k across the 28 of their papers we have counts for
18 papers · 1 filter
Unraveling the connection between high-order magnetic interactions and local-to-global spin Hamiltonian in non-collinear magnetic dimers
Ramon Cardias, Jhonatan dos Santos Silva, Anders Bergman +7
A spin Hamiltonian, which characterizes interatomic interactions between spin moments, is highly valuable in predicting and comprehending the magnetic properties of materials. A de…
Quantitative theory of magnetic interactions in solids
Attila Szilva, Yaroslav Kvashnin, Evgeny A. Stepanov +4
In this report we review the method of explicit calculations of interatomic exchange interactions of magnetic materials. This involves exchange mechanisms normally referred to as H…
Thermally-induced magnetic order from glassiness in elemental neodymium
Benjamin Verlhac, Lorena Niggli, Anders Bergman +8
Temperature in thermodynamics is synonymous with disorder, and responsible for ultimately destroying ordered phases. Here, we show an unusual magnetic transition where, with increa…
First-principles Dzyaloshinskii-Moriya interaction in a non-collinear framework
R. Cardias, A. Szilva, M. M. Bezerra-Neto +7
We have derived an expression of the Dzyaloshinskii-Moriya (DM) interaction, where all the three components of the DM vector can be calculated independently, for a general, non-col…
Nature of the magnetic moment of cobalt in ordered FeCo alloy
Arsenii Gerasimov, Lars Nordström, Sergii Khmelevskyi +2
The magnets are typically classified into Stoner and Heisenberg type, depending on the itinerant or localized nature of the constituent magnetic moments. In this work, we investiga…
Magnetic anisotropy in Permalloy: hidden quantum mechanical features
Debora C M Rodrigues, Angela B Klautau, Alexander Edström +5
By means of relativistic, first principles calculations, we investigate the microscopic origin of the vanishingly low magnetic anisotropy of Permalloy, here proposed to be intrinsi…
Microscopic origin of Heisenberg and non-Heisenberg exchange interactions in ferromagnetic bcc Fe
Y. O. Kvashnin, R. Cardias, A. Szilva +6
By means of first principles calculations we investigate the nature of exchange coupling in ferromagnetic bcc Fe on a microscopic level. Analyzing the basic electronic structure re…
Microscopic Theory for Coupled Atomistic Magnetization and Lattice Dynamics
J. Fransson, D. Thonig, P. F. Bessarab +3
A coupled atomistic spin and lattice dynamics approach is developed which merges the dynamics of these two degrees of freedom into a single set of coupled equations of motion. The…
Interatomic exchange interactions in non-collinear magnets
A. Szilva, M. Costa, A. Bergman +3
We derive ab inito exchange parameters for general non-collinear magnetic configurations, in terms of a multiple scattering formalism. We show that the general exchange formula has…
A route towards finding large magnetic anisotropy in nano-composites: application to a WRe/Fe multilayer
Sumanta Bhandary, Oscar Grånäs, Laszlo Szunyogh +3
We suggest here a novel nano-laminate, 5[Fe]/2[WRe] (x=0.6-0.8), with enhanced magnetic hardness in combination with a large saturation moment. The calculated magnetic…
Simulation of a spin-wave instability from atomistic spin dynamics
J. Hellsvik, B. Skubic, L. Nordström +1
We study the spin dynamics of a Heisenberg model at finite temperature in the presence of an external field or a uniaxial anisotropy. For the case of the uniaxial anisotropy our si…
Dynamics of diluted magnetic semiconductors from atomistic spin dynamics simulations: Mn doped GaAs as a case study
J. Hellsvik, B. Skubic, L. Nordström +4
The dynamical behavior of the magnetism of diluted magnetic semiconductors (DMS) has been investigated by means of atomistic spin dynamics simulations. The conclusions drawn from t…
A method for atomistic spin dynamics simulations: implementation and examples
B. Skubic, J. Hellsvik, L. Nordström +1
We present a method for performing atomistic spin dynamic simulations. A comprehensive summary of all pertinent details for performing the simulations such as equations of motions,…
Magnetic structure of Fe, Mn, and Cr clusters supported on Cu(111)
Anders Bergman, Lars Nordstrom, Angela Burlamaqui Klautau +2
The magnetic structures of small clusters of Fe, Mn, and Cr supported on a Cu(111) surface have been studied with non-collinear first principles theory. Different geometries such a…
Current driven magnetization dynamics in helical spin density waves
Ola Wessely, Bjorn Skubic, Lars Nordstrom
A mechanism is proposed for manipulating the magnetic state of a helical spin density wave using a current. In this paper, we show that a current through a bulk system with a helic…
First-principles approach to Non-Collinear Magnetism: towards Spin-dynamics
S. Sharma, J. K. Dewhurst, C. Ambrosch-Draxl +6
A description of non-collinear magnetism in the framework of spin-density functional theory is presented for the exact exchange energy functional which depends explicitly on two-co…
The Fermi Surface Effect on Magnetic Interlayer Coupling
Erik Holmström, Anders Bergman, Lars Nordström +3
The oscillating magnetic interlayer coupling of Fe over spacer layers consisting of CuPd alloys is investigated by first principles density functional theory. The amp…
Giant magnetic enhancement in Fe/Pd films and its influence on the magnetic interlayer coupling
Erik Holmström, Lars Nordström, A. M. N. Niklasson
The magnetic properties of thin Pd fcc(001) films with embedded monolayers of Fe are investigated by means of first principles density functional theory. The induced spin polarizat…