scholarly journals Resonant Enhancement of Exchange Coupling for Voltage-Controlled Magnetic Switching

2020 ◽  
Vol 14 (3) ◽  
Author(s):  
Shehrin Sayed ◽  
Cheng-Hsiang Hsu ◽  
Niklas Roschewsky ◽  
See-Hun Yang ◽  
Sayeef Salahuddin
Keyword(s):  
Exchange Coupling ◽  
Resonant Enhancement ◽  
Magnetic Switching

scholarly journals The impact of number of repeats N on the interlayer exchange in $$[\text {Fe/MgO}]_{N} $$(001) superlattices

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Tobias Warnatz ◽  
Fridrik Magnus ◽  
Nanny Strandqvist ◽  
Sarah Sanz ◽  
Hasan Ali ◽  
...  
Keyword(s):  
Quantum Well ◽  
Exchange Coupling ◽  
Neutron Reflectometry ◽  
Interlayer Exchange Coupling ◽  
Magnetic Switching ◽  
Interlayer Exchange ◽  
Quantum Well States ◽  
The Impact ◽  
Polarized Neutron Reflectometry ◽  
Mgo Layers

AbstractThe strength of the interlayer exchange coupling in [Fe/MgO]$$_N$$ N (001) superlattices with 2 ≤ N ≤ 10 depends on the number of bilayer repeats (N). The exchange coupling is antiferromagnetic for all the investigated thicknesses while being nine times larger in a sample with N = 4 as compared to N = 2. The sequence of the magnetic switching in two of the samples (N = 4, N = 8) is determined using polarized neutron reflectometry. The outermost layers are shown to respond at the lowest fields, consistent with having the weakest interlayer exchange coupling. The results are consistent with the existence of quantum well states defined by the thickness of the Fe and the MgO layers as well as the number of repeats (N) in [Fe/MgO]$$ _{N}$$ N (001)superlattices.

Interfacial Magnetoelectric Switching in Multiferroic Heterostructures

2014 ◽  
Vol 783-786 ◽  
pp. 1623-1627 ◽  
Author(s):  
Wolfgang Kleemann ◽  
Pavel Borisov ◽  
Xi Chen ◽  
Carolin Schmitz-Antoniak
Keyword(s):  
Data Processing ◽  
Electric Fields ◽  
Exchange Bias ◽  
Exchange Coupling ◽  
Transverse Magnetic ◽  
Electric Polarization ◽  
Surface Polarization ◽  
Magnetic Switching ◽  
Field Control ◽  
Multiferroic Heterostructures

Novel methods of switching magnetism with electric fields and vice versa, and aiming at magnetoelectric (ME) data processing are reported. First, the patented MERAM@ uses the electric field control of exchange bias via an epitaxial Cr2O3 layer and exchange coupling to a Pt/Co/Pt trilayer. It promises to crucially reduce Joule energy losses in RAM devices. Second, magnetic switching of the electric polarization by a transverse magnetic field in a 3-1 composite of a vertically poled BaTiO3 thick film embedding CoFe2O4 nanopillars produces a regular surface polarization pattern with rectangular symmetry. Its possible use for data processing is discussed.

Assessing the Calculation of Exchange Coupling Constants and Spin Crossover Gaps Using the Approximate Projection Model to Improve Density Function Calculations

2019 ◽  
Author(s):  
Xianghai Sheng ◽  
Lee Thompson ◽  
Hrant Hratchian
Keyword(s):  
Density Functional Theory ◽  
Exchange Coupling ◽  
Density Functional ◽  
Spin Crossover ◽  
Coupling Constants ◽  
Spin Projection ◽  
Coupling Constant ◽  
Projection Model ◽  
Functional Theory

This work evaluates the quality of exchange coupling constant and spin crossover gap calculations using density functional theory corrected by the Approximate Projection model. Results show that improvements using the Approximate Projection model range from modest to significant. This study demonstrates that, at least for the class of systems examined here, spin-projection generally improves the quality of density functional theory calculations of J-coupling constants and spin crossover gaps. Furthermore, it is shown that spin-projection can be important for both geometry optimization and energy evaluations. The Approximate Project model provides an affordable and practical approach for effectively correcting spin-contamination errors in molecular exchange coupling constant and spin crossover gap calculations.

The influence of interlayer exchange coupling on magnetic ordering in Fe/V superlattices

2009 ◽  
Vol 321 (9) ◽  
pp. 1214-1220 ◽  
Author(s):  
M. Marcellini ◽  
M. Pärnaste ◽  
B. Hjörvarsson ◽  
G. Nowak ◽  
H. Zabel
Keyword(s):  
Exchange Coupling ◽  
Magnetic Ordering ◽  
Interlayer Exchange Coupling ◽  
Interlayer Exchange
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