Co Nanodot Arrays Grown on a GdAu2 Template: Substrate/Nanodot Antiferromagnetic Coupling

Nano Letters ◽  
2014 ◽  
Vol 14 (6) ◽  
pp. 2977-2981 ◽  
Author(s):  
Laura Fernández ◽  
María Blanco-Rey ◽  
Maxim Ilyn ◽  
Lucia Vitali ◽  
Ana Magaña ◽  
...  
Keyword(s):  
Antiferromagnetic Coupling ◽  
Nanodot Arrays ◽  
Template Substrate

Interfacial antiferromagnetic coupling and high spin polarization in metallic phthalocyanines

2021 ◽  
Vol 103 (2) ◽  
Author(s):  
Junwei Tong ◽  
Feifei Luo ◽  
Liuxia Ruan ◽  
Guohuai Liu ◽  
Lianqun Zhou ◽  
...  
Keyword(s):  
Spin Polarization ◽  
High Spin ◽  
Antiferromagnetic Coupling ◽  
High Spin Polarization

scholarly journals Micromagnetic Simulations of Fe and Ni Nanodot Arrays Surrounded by Magnetic or Non-Magnetic Matrices

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 349
Author(s):  
Devika Sudsom ◽  
Andrea Ehrmann
Keyword(s):  
Magnetic Materials ◽  
Data Storage ◽  
Magnetization Reversal ◽  
Hysteresis Loops ◽  
Object Oriented ◽  
Basic Research ◽  
Memory Systems ◽  
The Other ◽  
Micromagnetic Simulations ◽  
Nanodot Arrays

Combining clusters of magnetic materials with a matrix of other magnetic materials is very interesting for basic research because new, possibly technologically applicable magnetic properties or magnetization reversal processes may be found. Here we report on different arrays combining iron and nickel, for example, by surrounding circular nanodots of one material with a matrix of the other or by combining iron and nickel nanodots in air. Micromagnetic simulations were performed using the OOMMF (Object Oriented MicroMagnetic Framework). Our results show that magnetization reversal processes are strongly influenced by neighboring nanodots and the magnetic matrix by which the nanodots are surrounded, respectively, which becomes macroscopically visible by several steps along the slopes of the hysteresis loops. Such material combinations allow for preparing quaternary memory systems, and are thus highly relevant for applications in data storage and processing.

scholarly journals Complex magnetic properties associated with competing local and itinerant magnetism in $${\text {Pr}}_2 {\text {Co}}_{0.86} {\text {Si}}_{2.88}$$

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mily Kundu ◽  
Santanu Pakhira ◽  
Renu Choudhary ◽  
Durga Paudyal ◽  
N. Lakshminarasimhan ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Neutron Diffraction ◽  
Single Phase ◽  
Magnetic Transition ◽  
Muon Spin Rotation ◽  
Antiferromagnetic Coupling ◽  
Diffraction Measurement ◽  
Zero Field ◽  
Crystalline Electric Field ◽  
X Ray

AbstractTernary intermetallic compound $${\text {Pr}}_2 {\text {Co}}_{0.86} {\text {Si}}_{2.88}$$ Pr 2 Co 0.86 Si 2.88 has been synthesized in single phase and characterized by x-ray diffraction, scanning electron microscopy with energy dispersive x-ray spectroscopy (SEM-EDX) analysis, magnetization, heat capacity, neutron diffraction and muon spin rotation/relaxation ($$\mu$$ μ SR) measurements. The polycrystalline compound was synthesized in single phase by introducing necessary vacancies in Co/Si sites. Magnetic, heat capacity, and zero-field neutron diffraction studies reveal that the system undergoes magnetic transition below $$\sim$$ ∼ 4 K. Neutron diffraction measurement further reveals that the magnetic ordering is antiferromagnetic in nature with an weak ordered moment. The high temperature magnetic phase has been attributed to glassy in nature consisting of ferromagnetic clusters of itinerant (3d) Co moments as evident by the development of internal field in zero-field $$\mu$$ μ SR below 50 K. The density-functional theory (DFT) calculations suggest that the low temperature magnetic transition is associated with antiferromagnetic coupling between Pr 4f and Co 3d spins. Pr moments show spin fluctuation along with unconventional orbital moment quenching due to crystal field. The evolution of the symmetry and the crystalline electric field environment of Pr-ions are also studied and compared theoretically between the elemental Pr and when it is coupled with other elements such as Co. The localized moment of Pr 4f and itinerant moment of Co 3d compete with each other below $$\sim$$ ∼ 20 K resulting in an unusual temperature dependence of magnetic coercivity in the system.

Spin reorientation via antiferromagnetic coupling

2014 ◽  
Vol 115 (17) ◽  
pp. 17C103 ◽  
Author(s):  
M. Ranjbar ◽  
R. Sbiaa ◽  
R. K. Dumas ◽  
J. Åkerman ◽  
S. N. Piramanayagam
Keyword(s):  
Spin Reorientation ◽  
Antiferromagnetic Coupling

ChemInform Abstract: [V16O38(CN)]9-: A Soluble Mixed-Valence Redox-Active Building Block with Strong Antiferromagnetic Coupling.

ChemInform ◽  
2012 ◽  
Vol 43 (45) ◽  
pp. no-no
Author(s):  
Tony D. Keene ◽  
Deanna M. D'Alessandro ◽  
Karl W. Kraemer ◽  
Jason R. Price ◽  
David J. Price ◽  
...  
Keyword(s):  
Building Block ◽  
Mixed Valence ◽  
Antiferromagnetic Coupling ◽  
Redox Active

Marked enhancement of synthetic-antiferromagnetic coupling in subnanocrystalline FeCoB∕Ru∕FeCoB sputtered films

2006 ◽  
Vol 89 (3) ◽  
pp. 032511 ◽  
Author(s):  
Atsushi Hashimoto ◽  
Shin Saito ◽  
Kazumi Omori ◽  
Hiroshi Takashima ◽  
Tomonori Ueno ◽  
...  
Keyword(s):  
Antiferromagnetic Coupling ◽  
Sputtered Films ◽  
Marked Enhancement

Relation between Magnetic, Spectroscopic and Structural Properties of Binuclear Copper(II) Complexes of Pentadentate Schiff-base Ligand, Semi-empirical and ab-initio Calculations

2003 ◽  
Vol 58 (5-6) ◽  
pp. 363-372 ◽  
Author(s):  
Y. Elerman ◽  
H. Kara ◽  
A. Elmali
Keyword(s):  
Ab Initio ◽  
Coupling Constants ◽  
Antiferromagnetic Coupling ◽  
X Ray Diffraction ◽  
Hartree Fock ◽  
Ligand Orbital ◽  
Rhf Calculations ◽  
The Difference ◽  
Semi Empirical

The synthesis and characterization of [Cu2(L1)(3,5 prz)] (L1=1,3-Bis(2-hydroxy-3,5-chlorosalicylideneamino) propan-2-ol) 1 and of [Cu2(L2)(3,5 prz)] (L2=1,3-Bis(2-hydroxy-bromosalicylideneamino) propan-2-ol) 2 are reported. The compounds were studied by elemental analysis, infrared and electronic spectra. The structure of the Cu2(L1)(3,5 prz)] complex was determined by x-ray diffraction. The magnetochemical characteristics of these compounds were determined by temperaturedependent magnetic susceptibility measurements, revealing their antiferromagnetic coupling. The superexchange coupling constants are 210 cm−1 for 1 and 440 cm−1 for 2. The difference in the magnitude of the coupling constants was explained by the metal-ligand orbital overlaps and confirmed by ab-initio restricted Hartree-Fock (RHF) calculations. In order to determine the nature of the frontier orbitals, Extended Hückel Molecular Orbital (EHMO) calculations are also reported.

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