Magnetic Interactions and Magnetic Anisotropy in Exchange Coupled 4f-3d Systems: A Case Study of a Heterodinuclear Ce3+-Fe3+Cyanide-Bridged Complex

2009 ◽  
Vol 15 (6) ◽  
pp. 1377-1388 ◽  
Author(s):  
Lorenzo Sorace ◽  
Claudio Sangregorio ◽  
Albert Figuerola ◽  
Cristiano Benelli ◽  
Dante Gatteschi
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetic Interactions

scholarly journals Magnetic interactions at the origin of abnormal magnetic fabrics in lava flows: a case study from Kerguelen flood basalts

2012 ◽  
Vol 189 (2) ◽  
pp. 815-832 ◽  
Author(s):  
G. Fanjat ◽  
P. Camps ◽  
V. Shcherbakov ◽  
F. Barou ◽  
M. T. Sougrati ◽  
...  
Keyword(s):  
Lava Flows ◽  
Magnetic Interactions ◽  
Flood Basalts ◽  
Magnetic Fabrics

Nano-structured (Mo,Ti)C-C-Ni magnetic powder

2018 ◽  
Vol 1 (86) ◽  
pp. 5-13
Author(s):  
S.M. Kaczmarek ◽  
A. Biedunkiewicz ◽  
T. Bodziony ◽  
P. Figiel ◽  
T. Skibiński ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Long Range ◽  
Low Temperatures ◽  
Temperature Increase ◽  
Magnetic Interactions ◽  
Magnetic Powder ◽  
Magnetic Phases

Different kinds of structural and magnetic phases have been found in the investigated compounds, e.g. (Mo, Ti)C, C, Ni. It was found that such different phases create different kinds of magnetic interactions, from paramagnetic, antiferromagnetic up to superparamagnetic. Significant magnetic anisotropy has been revealed for low temperatures, which lowers with temperature increase. Moreover, non-usual increasing of the magnetization as a function of temperature was observed. It suggests, that overall long-range AFM interaction may be responsible for the magnetic properties.

Analysis of the electrostatics in DyIII single-molecule magnets: the case study of Dy(Murex)3

2015 ◽  
Vol 44 (41) ◽  
pp. 18270-18275 ◽  
Author(s):  
J. Jung ◽  
X. Yi ◽  
G. Huang ◽  
G. Calvez ◽  
C. Daiguebonne ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Ab Initio ◽  
Single Molecule ◽  
Site Symmetry ◽  
Molecular Symmetry ◽  
Predominant Role ◽  
Single Molecule Magnets ◽  
Single Molecule Magnet

A DyIII-based single-molecule magnet is reported. Ab initio calculations highlight that molecular symmetry plays a predominant role over site symmetry in determining the shape and orientation of DyIII magnetic anisotropy.

scholarly journals Nanomachining-enabled strain manipulation of magnetic anisotropy in the free-standing GaMnAs nanostructures

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Chanuk Yang ◽  
Jae-Hyun Lee ◽  
Myunglae Jo ◽  
Hyung Kook Choi ◽  
Seondo Park ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Hall Effect ◽  
Lattice Mismatch ◽  
Strain Relaxation ◽  
Compressive Strain ◽  
Anomalous Hall Effect ◽  
Magnetic Interactions ◽  
Memory Element ◽  
Free Standing ◽  
Spin Orbit Interactions

Abstract Strain perturbs atomic ordering in solids, with far-reaching consequences from an increased carrier mobility to localization in Si, stabilization of electric dipoles and nanomechanical transistor action in oxides, to the manipulation of spins without applying magnetic fields in n-GaAs. In GaMnAs, a carrier-mediated ferromagnetic semiconductor, relativistic spin-orbit interactions – highly strain-dependent magnetic interactions – play a crucial role in determining the magnetic anisotropy (MA) and anisotropic magnetoresistance (AMR). Strain modifies the MA and AMR in a nanomachined GaMnAs structure as measured by the anomalous Hall effect (AHE) and the planar Hall effect (PHE). Here, we report an MA modification by strain relaxation in an isolated GaMnAs Hall bar structure and by applying a range of local strains via fabricating asymmetrically mechanically buckled GaMnAs micro-Hall bar structures. In the AHE and PHE measurements, we observe a reduction in the in-plane MA and an enhancement in the out-of-plane MA as the compressive strain due to the lattice mismatch relaxes in the suspended structure. The functionality of such mechanical manipulation, as well as the two-level mechanical state and the corresponding AHE responses, is demonstrated by a fully scalable binary mechanical memory element in a GaMnAs single Hall cross structure.

Magnetic Interactions Versus Magnetic Anisotropy in Spinel Ferrite Nanoparticles

2019 ◽  
Vol 10 ◽  
pp. 1-5 ◽  
Author(s):  
Giuseppe Muscas ◽  
Davide Peddis ◽  
Marco Cobianchi ◽  
Alessandro Lascialfari ◽  
Carla Cannas ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Spinel Ferrite ◽  
Ferrite Nanoparticles ◽  
Magnetic Interactions

Calculation of the magnetic anisotropy with projected-augmented-wave methodology and the case study of disorderedFe1−xCoxalloys

2016 ◽  
Vol 93 (22) ◽  
Author(s):  
Soner Steiner ◽  
Sergii Khmelevskyi ◽  
Martijn Marsmann ◽  
Georg Kresse
Keyword(s):  
Magnetic Anisotropy

Magnetic interactions in silica coated nanoporous assemblies of CoFe2O4nanoparticles with cubic magnetic anisotropy

2010 ◽  
Vol 21 (31) ◽  
pp. 315701 ◽  
Author(s):  
S Laureti ◽  
G Varvaro ◽  
A M Testa ◽  
D Fiorani ◽  
E Agostinelli ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetic Interactions

scholarly journals Magnetic Guinier law

IUCrJ ◽  
2020 ◽  
Vol 7 (1) ◽  
pp. 136-142 ◽  
Author(s):  
Andreas Michels ◽  
Artem Malyeyev ◽  
Ivan Titov ◽  
Dirk Honecker ◽  
Robert Cubitt ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Small Angle ◽  
Materials Science ◽  
Anisotropy Field ◽  
Type Systems ◽  
Small Angle Scattering ◽  
Magnetic Interactions ◽  
X Rays ◽  
Angle Scattering ◽  
Guinier Law

Small-angle scattering of X-rays and neutrons is a routine method for the determination of nanoparticle sizes. The so-called Guinier law represents the low-q approximation for the small-angle scattering curve from an assembly of particles. The Guinier law has originally been derived for nonmagnetic particle-matrix-type systems and it is successfully employed for the estimation of particle sizes in various scientific domains (e.g. soft-matter physics, biology, colloidal chemistry, materials science). An important prerequisite for it to apply is the presence of a discontinuous interface separating particles and matrix. Here, the Guinier law is introduced for the case of magnetic small-angle neutron scattering and its applicability is experimentally demonstrated for the example of nanocrystalline cobalt. It is well known that the magnetic microstructure of nanocrystalline ferromagnets is highly nonuniform on the nanometre length scale and characterized by a spectrum of continuously varying long-wavelength magnetization fluctuations, i.e. these systems do not manifest sharp interfaces in their magnetization profile. The magnetic Guinier radius depends on the applied magnetic field, on the magnetic interactions (exchange, magnetostatics) and on the magnetic anisotropy-field radius, which characterizes the size over which the magnetic anisotropy field is coherently aligned into the same direction. In contrast to the nonmagnetic conventional Guinier law, the magnetic version can be applied to fully dense random-anisotropy-type ferromagnets.

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