Density functional studies on the exchange interaction of a dinuclear Gd(iii)–Cu(ii) complex: method assessment, magnetic coupling mechanism and magneto-structural correlations

2009 ◽  
pp. 3153 ◽  
Author(s):  
Gopalan Rajaraman ◽  
Federico Totti ◽  
Alessandro Bencini ◽  
Andrea Caneschi ◽  
Roberta Sessoli ◽  
...  
Keyword(s):  
Exchange Interaction ◽  
Density Functional ◽  
Magnetic Coupling ◽  
Complex Method ◽  
Coupling Mechanism ◽  
Functional Studies

Theoretical insights into the origin of magnetic exchange and magnetic anisotropy in {ReIV–MII} (M = Mn, Fe, Co, Ni and Cu) single chain magnets

2016 ◽  
Vol 45 (19) ◽  
pp. 8201-8214 ◽  
Author(s):  
Saurabh Kumar Singh ◽  
Kuduva R. Vignesh ◽  
Velloth Archana ◽  
Gopalan Rajaraman
Keyword(s):  
Magnetic Anisotropy ◽  
Exchange Interaction ◽  
Density Functional Calculations ◽  
Density Functional ◽  
Magnetic Coupling ◽  
Single Chain ◽  
Magnetic Exchange Interaction ◽  
Magnetic Exchange ◽  
Single Chain Magnets

Density functional calculations have been performed on a series of {ReIV–MII} (M = Mn(1), Fe(2), Co(3), Ni(4), Cu(5)) complexes to compute the magnetic exchange interaction between the ReIV and MII ions, and understand the mechanism of magnetic coupling in this series.

scholarly journals Non-local effect of impurity states on the exchange coupling mechanism in magnetic topological insulators

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Thiago R. F. Peixoto ◽  
Hendrik Bentmann ◽  
Philipp Rüßmann ◽  
Abdul-Vakhab Tcakaev ◽  
Martin Winnerlein ◽  
...  
Keyword(s):  
Density Functional ◽  
Topological Insulators ◽  
Magnetic Circular Dichroism ◽  
Magnetic Coupling ◽  
Exchange Interactions ◽  
Local Effect ◽  
Coupling Mechanism ◽  
Impurity States ◽  
Resonant Photoemission ◽  
Densities Of States

AbstractSince the discovery of the quantum anomalous Hall (QAH) effect in the magnetically doped topological insulators (MTI) Cr:(Bi,Sb)2Te3 and V:(Bi,Sb)2Te3, the search for the magnetic coupling mechanisms underlying the onset of ferromagnetism has been a central issue, and a variety of different scenarios have been put forward. By combining resonant photoemission, X-ray magnetic circular dichroism and density functional theory, we determine the local electronic and magnetic configurations of V and Cr impurities in (Bi,Sb)2Te3. State-of-the-art first-principles calculations find pronounced differences in their 3d densities of states, and show how these impurity states mediate characteristic short-range pd exchange interactions, whose strength sensitively varies with the position of the 3d states relative to the Fermi level. Measurements on films with varying host stoichiometry support this trend. Our results explain, in an unified picture, the origins of the observed magnetic properties, and establish the essential role of impurity-state-mediated exchange interactions in the magnetism of MTI.

A Magnetic Drive Actuator for Micro Electrical Discharge Machining

2012 ◽  
Vol 591-593 ◽  
pp. 303-306
Author(s):  
Xiao You Zhang ◽  
Akio Kifuji ◽  
Dong Jue He
Keyword(s):  
Electrical Discharge ◽  
High Speed ◽  
Degrees Of Freedom ◽  
Electrical Discharge Machining ◽  
Magnetic Coupling ◽  
Magnetic Bearings ◽  
Coupling Mechanism ◽  
Micro Electrical Discharge Machining ◽  
Long Stroke ◽  
Magnetic Drive

Electrical discharge machining has the capability of machining all conductive materials regardless of hardness, and has the ability to deal with complex shapes. However, the speed and accuracy of conventional EDM are limited by probability and efficiency of the electrical discharges. This paper describes a three degrees of freedom (3-DOF) controlled, wide-bandwidth, high-precision, long-stroke magnetic drive actuator. The actuator can be attached to conventional electrical discharge machines to realize a high-speed and high-accuracy EDM. The actuator primarily consists of thrust and radial magnetic bearings, thrust and radial air bearings and a magnetic coupling mechanism. By using the thrust and radial magnetic bearings, the translational motions of the spindle can be controlled. The magnetic drive actuator possesses a positioning resolution of the order of micrometer, a bandwidth greater than 100Hz and a positioning stroke of 2mm.

Density functional studies on the adsorption and decomposition of SO2 on Cu(100)

2001 ◽  
Vol 115 (1) ◽  
pp. 454-465 ◽  
Author(s):  
José A. Rodriguez ◽  
Josep M. Ricart ◽  
Anna Clotet ◽  
Francesc Illas
Keyword(s):  
Density Functional ◽  
Functional Studies
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