Simplified first principles approach to exchange coupling in magnetic multilayers

1993 ◽  
Vol 71 (12) ◽  
pp. 1923-1926 ◽  
Author(s):  
Mark van Schilfgaarde ◽  
Frank Herman
Keyword(s):  
First Principles ◽  
Exchange Coupling ◽  
Magnetic Multilayers

AB-INITIO BAND STRUCTURE CALCULATION FOR MAGNETIC MULTILAYERS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 456-459 ◽  
Author(s):  
J. STICHT ◽  
F. HERMAN ◽  
J. KÜBLER
Keyword(s):  
Magnetic Properties ◽  
Band Structure ◽  
Total Energy ◽  
Ab Initio ◽  
Coupling Strength ◽  
First Principles ◽  
Exchange Coupling ◽  
Magnetic Multilayers ◽  
Structure Calculation ◽  
Band Structure Calculation

The magnetic properties of magnetic multilayers are studied using first principles total energy calculations. In this paper we present our results for bcc Fe multilayers with a (001) stacking direction. Using Nb as a spacer material we find an oscillating exchange coupling with a period of about 4.6 Å( ≈3 Nb monolayers). A detailed study of the magetic moments in the Nb spacer is given. Furthermore we discuss the dependence of the exchange coupling strength as a function of the thickness of the Fe slabs.

Long and Short Range Oscillatory Exchange Coupling in Fe/Cu and Co/Cu Magnetic Multilayers

1991 ◽  
Vol 231 ◽  
Author(s):  
F. Herman ◽  
J. Sticht ◽  
M. Van Schilfgaarde
Keyword(s):  
Long Range ◽  
First Principles ◽  
Exchange Coupling ◽  
Short Range ◽  
Physical Mechanism ◽  
Magnetic Multilayers ◽  
Electronic Transitions ◽  
Fermi Sphere ◽  
Spacer Thickness ◽  
Oscillatory Coupling

AbstractBy carrying out accurate first-principles superlattice calculations, we determined the exchange coupling in bcc Fe/Cu and fcc Co/Cu multilayers as a function of the Cu spacer thickness. The fact that we can obtain long-range oscillatory coupling directly from first principles suggests that our theoretical model includes the underlying physical mechanism, and that such coupling is indeed a band structure effect. The exchange coupling depends on the interfacial orientation as well as on the Cu spacer thickness. In bcc [001] Fe/Cu, fcc [001] Co/Cu, and fcc [110] Co/Cu, the coupling has both long and short-range oscillatory components, while in fcc [111] Co/Cu, the long-range component dominates. Using a simplified model for the Fermi surface of the Cu spacer, we can relate the short-range oscillations to electronic transitions across the Fermi sphere, and the long-range oscillations to electronic transitions between spheres in adjacent zones in extended k-space, i.e., to interzonal transitions.

scholarly journals First-Principles Quantum Transport Modeling of Spin-Transfer and Spin-Orbit Torques in Magnetic Multilayers

2018 ◽  
pp. 1-35 ◽  
Author(s):  
Branislav K. Nikolić ◽  
Kapildeb Dolui ◽  
Marko D. Petrović ◽  
Petr Plecháč ◽  
Troels Markussen ◽  
...  
Keyword(s):  
Quantum Transport ◽  
First Principles ◽  
Magnetic Multilayers ◽  
Spin Transfer ◽  
Transport Modeling ◽  
Spin Orbit

scholarly journals FREE ELECTRON MODEL STUDY ON INTERLAYER EXCHANGE COUPLING IN MAGNETIC MULTILAYERS

1996 ◽  
Vol 45 (5) ◽  
pp. 869
Author(s):  
YANG GUO-LIN ◽  
LI BO-ZANG ◽  
LI LIE-MING ◽  
SUN GANG ◽  
WU JIAN-HUA ◽  
...  
Keyword(s):  
Free Electron ◽  
Exchange Coupling ◽  
Magnetic Multilayers ◽  
Interlayer Exchange Coupling ◽  
Electron Model ◽  
Model Study ◽  
Free Electron Model ◽  
Interlayer Exchange

Gilbert Damping in Annealed Perpendicular Exchange Biased CoFeB/Pt/MnIr Multilayers

SPIN ◽  
2020 ◽  
Vol 10 (01) ◽  
pp. 2050008
Author(s):  
Hai-Lin Hu ◽  
Jia-Qi Yan ◽  
Wei Li ◽  
Xiao-Yu Yang ◽  
Shi-Tao Lou ◽  
...  
Keyword(s):  
Exchange Bias ◽  
Exchange Coupling ◽  
Magnetic Multilayers ◽  
Gilbert Damping ◽  
Time Resolved ◽  
Pump Probe ◽  
Spin Pumping ◽  
Pulsed Dc ◽  
Pulsed Dc Magnetron Sputtering ◽  
Different Thickness

Exchange bias and intrinsic Gilbert damping [Formula: see text] are two important parameters in magnetic multilayers. To explore the correlation between exchange coupling and damping, the samples Ta (2.6[Formula: see text]nm)/Pt (2.5[Formula: see text]nm)/Co[Formula: see text]Fe[Formula: see text]B[Formula: see text] (0.63[Formula: see text]nm)/Pt (0.5[Formula: see text]nm)/Mn[Formula: see text]Ir[Formula: see text] ([Formula: see text])/Ta (4[Formula: see text]nm) are deposited by using pulsed-DC magnetron sputtering. The static and dynamic magnetic responses with different thickness of antiferromagnetic MnIr are investigated using vibrating sample magnetometer (VSM) and the pump-probe time-resolved magneto-optical Kerr effect (TR-MOKE). The exchange bias initially increases and then decreases with increasing thickness of MnIr layer, which is associated with the interfacial exchange coupling. The dynamic results demonstrate that the Gilbert damping of CoFeB/Pt/MnIr can increase by up to 40% compared with CoFeB/Pt. Based on the fact that the spin pumping has been excluded because of the Pt interlayer, we attribute the enhancement in Gilbert damping to the exchange coupling between AFM and FM.

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