scholarly journals Accelerating spin-space sampling by auxiliary spin dynamics and temperature-dependent spin-cluster expansion

2019 ◽  
Vol 99 (9) ◽  
Author(s):  
Ning Wang ◽  
Thomas Hammerschmidt ◽  
Jutta Rogal ◽  
Ralf Drautz
Keyword(s):  
Cluster Expansion ◽  
Spin Dynamics ◽  
Spin Space ◽  
Temperature Dependent ◽  
Spin Cluster

Modeling of Temperature Dependence of Magnetization in TbFe Films — An Atomistic Spin Simulation Study

SPIN ◽  
2016 ◽  
Vol 06 (01) ◽  
pp. 1650003 ◽  
Author(s):  
Xiankai Jiao ◽  
Zongzhi Zhang ◽  
Yaowen Liu
Keyword(s):  
Spin Dynamics ◽  
Mean Field ◽  
Recovery Process ◽  
Field Approximation ◽  
Mean Field Approximation ◽  
Temperature Dependent ◽  
Simulation Code ◽  
Basic Physics ◽  
Temperature Dependent Properties ◽  
Strength Formula

In this paper, we performed spin simulations at atomistic level to study the temperature dependent properties of perpendicularly magnetized TbFe thin films. The crystallographically amorphous feature of TbFe ferrimagnetic alloys is modeled by using a lattice system with disordered site occupation of rare earth (RE) and transition metal (TM) spins. The simulated Curie temperature ([Formula: see text]) is consistent well with the mean-field approximation theory. With the increase of Tb concentration, the [Formula: see text] decreases almost linearly, whereas the magnetization compensation temperature ([Formula: see text]) increases gradually until the [Formula: see text] value is reached. The inter-sublattice exchange coupling strength [Formula: see text] between the RE and TM atoms can significantly affect [Formula: see text], but has less impact on [Formula: see text]. With the increase of Tb concentration, the TbFe sample of high [Formula: see text] exhibits a much faster increase in [Formula: see text] than the sample with low [Formula: see text]. Moreover, we have tested the simulation code to model the laser pulse induced ultrafast nonequilibrium spin dynamics. As an example, the femto-second pulse laser induced demagnetization and recovery process is clearly reproduced. These features are in a good agreement with the experiments, indicating that the simulation model can capture the basic physics in describing the high temperature dependent magnetic property as well as the ultrafast spin dynamics.

scholarly journals Kinetic Versus Thermodynamic Metalation Enables Synthesis of Isostructural Homo- and Heterometallic Trinuclear Clusters

2020 ◽  
Author(s):  
Sung-Min Hyun ◽  
Apoorva Upadhyay ◽  
Anuvab Das ◽  
Corey Burns ◽  
Siyoung Sung ◽  
...  
Keyword(s):  
Cluster Expansion ◽  
Metal Clusters ◽  
Systematic Variation ◽  
Selective Synthesis ◽  
Temperature Dependent ◽  
Ion Content ◽  
Trinuclear Complexes ◽  
Trinuclear Clusters ◽  
Hexadentate Ligand ◽  
Programmed Assembly

Temperature-dependent metalation of the new hexadentate ligand (tris(5-(pyridin-2-yl)-1<i>H</i>-pyrrol-2-yl)methane; H<sub>3</sub>TPM) enables the selective synthesis of both mononuclear (<i>i.e. </i>Na(THF)<sub>4</sub>[Fe(TPM)], kinetic product) and trinuclear (<i>i.e.</i> Fe<sub>3</sub>(TPM)<sub>2</sub>, thermodynamic product) complexes. Exposure of Na(THF)<sub>4</sub>[Fe(TPM)] to FeCl<sub>2</sub> or ZnCl<sub>2</sub> triggers cluster expansion to generate homo- or heterometallic trinuclear complexes, respectively. The developed approach enables systematic variation of ion content in isostructural metal clusters via programmed assembly.

scholarly journals Normal-state spin dynamics and temperature-dependent spin-resonance energy in optimally doped BaFe1.85Co0.15As2

2009 ◽  
Vol 6 (3) ◽  
pp. 178-181 ◽  
Author(s):  
D. S. Inosov ◽  
J. T. Park ◽  
P. Bourges ◽  
D. L. Sun ◽  
Y. Sidis ◽  
...  
Keyword(s):  
Normal State ◽  
Spin Dynamics ◽  
Resonance Energy ◽  
Temperature Dependent ◽  
Spin Resonance ◽  
State Spin

Spin dynamics in a site diluted finite spin cluster system probed by positive muons

1993 ◽  
Vol 78 (1-4) ◽  
pp. 429-433 ◽  
Author(s):  
Kenji Kojima ◽  
Kusuo Nishiyama ◽  
Kanetada Nagamine ◽  
Hironobu Ikeda
Keyword(s):  
Spin Dynamics ◽  
Cluster System ◽  
Spin Cluster ◽  
A Site

scholarly journals Kinetic Versus Thermodynamic Metalation Enables Synthesis of Isostructural Homo- and Heterometallic Trinuclear Clusters

2020 ◽  
Author(s):  
Sung-Min Hyun ◽  
Apoorva Upadhyay ◽  
Anuvab Das ◽  
Corey Burns ◽  
Siyoung Sung ◽  
...  
Keyword(s):  
Cluster Expansion ◽  
Metal Clusters ◽  
Systematic Variation ◽  
Selective Synthesis ◽  
Temperature Dependent ◽  
Ion Content ◽  
Trinuclear Complexes ◽  
Trinuclear Clusters ◽  
Hexadentate Ligand ◽  
Programmed Assembly

Temperature-dependent metalation of the new hexadentate ligand (tris(5-(pyridin-2-yl)-1<i>H</i>-pyrrol-2-yl)methane; H<sub>3</sub>TPM) enables the selective synthesis of both mononuclear (<i>i.e. </i>Na(THF)<sub>4</sub>[Fe(TPM)], kinetic product) and trinuclear (<i>i.e.</i> Fe<sub>3</sub>(TPM)<sub>2</sub>, thermodynamic product) complexes. Exposure of Na(THF)<sub>4</sub>[Fe(TPM)] to FeCl<sub>2</sub> or ZnCl<sub>2</sub> triggers cluster expansion to generate homo- or heterometallic trinuclear complexes, respectively. The developed approach enables systematic variation of ion content in isostructural metal clusters via programmed assembly.

Magnetic Cluster Expansion Study of Chromium Precipitates in Fe-Cr Alloys

2011 ◽  
Vol 172-174 ◽  
pp. 1002-1007 ◽  
Author(s):  
Mikhail Yu. Lavrentiev ◽  
Duc Nguyen Manh ◽  
Sergei L. Dudarev
Keyword(s):  
Cluster Expansion ◽  
Magnetic Order ◽  
Magnetic Ordering ◽  
Expansion Method ◽  
Temperature Dependent ◽  
Magnetic Cluster ◽  
Cluster Expansion Method ◽  
Atom Pairs ◽  
Characteristic Variation ◽  
Magnetic Specific Heat

Magnetic Cluster Expansion method is applied to the investigation of magnetic properties of Fe-Cr alloys treated as a function of Cr content, the spatial distribution of Cr atoms, and temperature. Random Fe-Cr alloys and Cr clusters formed in concentrated alloys are analyzed. We find significant differences between the types of magnetic order characterizing those systems, which are reflected in the characteristic variation of the temperature-dependent magnetic specific heat. Simulations show that in random Fe-Cr alloys and in alloys containing Cr clusters, the interplay between antiferromagnetic interactions characterizing Fe-Cr and Cr-Cr atom pairs gives rise to unusual patterns of finite temperature magnetic ordering.

scholarly journals Atomistic spin model based on a spin-cluster expansion technique: Application to the IrMn3/Co interface

2011 ◽  
Vol 83 (2) ◽  
Author(s):  
L. Szunyogh ◽  
L. Udvardi ◽  
J. Jackson ◽  
U. Nowak ◽  
R. Chantrell
Keyword(s):  
Cluster Expansion ◽  
Spin Model ◽  
Spin Cluster ◽  
Model Based ◽  
Expansion Technique
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