Laser enhanced RKKY interaction in nanorings

2014 ◽  
Vol 28 (25) ◽  
pp. 1450174
Author(s):  
Peng Feng ◽  
Chunyu Yin
Keyword(s):  
Exchange Interaction ◽  
Quantum Communication ◽  
Three Dimensional ◽  
Unexpected Result ◽  
Magnetic Impurities ◽  
Rkky Interaction ◽  
Quantum Rings ◽  
Conduction Electrons ◽  
Indirect Exchange ◽  
Nonmagnetic Metals

The conduction electrons can deliver an indirect exchange interaction, namely RKKY interaction, between impurities dissolved in nonmagnetic metals or semiconductors by the interaction between the conduction electron spins and localized impurity spins. In two- and three-dimensional systems this interaction is very weak when the separation of impurities is large enough. However, an unexpected result exists in quantum rings. In this work we find that the laser can effectively enhance RKKY interaction in quantum rings on certain conditions, and there is a critical width of keeping this effect for the tube-like nanorings. As a possible application of this effect, it would provide a mechanism of realizing quantum communication by magnetic impurities.

Optical resonant RKKY interaction in nanosystems

2015 ◽  
Vol 93 (11) ◽  
pp. 1269-1273
Author(s):  
Peng Feng ◽  
Jianqiao Xie
Keyword(s):  
Exchange Interaction ◽  
Conduction Electron ◽  
Laser Field ◽  
Magnetic Impurity ◽  
Magnetic Impurities ◽  
Rkky Interaction ◽  
Resonant Frequencies ◽  
Spintronic Devices ◽  
Indirect Exchange ◽  
Nonmagnetic Metals

Conduction electron spins interacting with magnetic impurity spins can lead to an indirect exchange interaction between magnetic impurities in nonmagnetic metals or semiconductors, namely, RKKY interaction. In general, this RKKY coupling is too weak to apply on devices. In this paper, we find that when a laser field of appropriate frequency irradiates the nanosystems, it can greatly strengthen the RKKY interaction. This is the so-called optical resonant RKKY interaction. We give the resonant frequencies for different size samples, and calculate the exchange integrals for these samples on the near-resonant conditions. This optical resonant RKKY coupling may be strong enough to guarantee its application on spintronic devices.

scholarly journals Floquet Control of Indirect Exchange Interaction in Periodically Driven Two-Dimensional Electron Systems

2021 ◽  
Author(s):  
Mahmoud M. Asmar ◽  
Wang-Kong Tse
Keyword(s):  
Exchange Interaction ◽  
Dynamic Control ◽  
Electron System ◽  
Two Dimensional ◽  
Rkky Interaction ◽  
Indirect Exchange Interaction ◽  
Magnetic Structures ◽  
Matter Coupling ◽  
Periodically Driven ◽  
Indirect Exchange

Abstract We present a theory for the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction mediated by a two-dimensional (2D) electron system subjected to periodic driving. This is demonstrated for a 2D metal with two ferromagnetic chains deposited in parallel. Our calculations reveal new non-analytic features in the time-averaged spin susceptibility. For weak light-matter coupling, the RKKY interaction shows oscillations with a period tunable by the light amplitude and frequency. For stronger light-matter coupling, the interaction becomes non-oscillatory and remains purely ferromagnetic. Our findings open a path forward for realizing dynamic control of the indirect exchange interaction in two-dimensional magnetic structures.

scholarly journals Уменьшение обменного смещения, вызванное ростом эффективной толщины слоя меди в гетероструктурах NiFe/Cu/IrMn

2020 ◽  
Vol 62 (11) ◽  
pp. 1774
Author(s):  
Р.Б. Моргунов ◽  
М.В. Бахметьев ◽  
А.Д. Таланцев
Keyword(s):  
Exchange Interaction ◽  
Magnetization Reversal ◽  
Exchange Bias ◽  
Copper Layer ◽  
Effective Thickness ◽  
Structural Quality ◽  
Conduction Electrons ◽  
Indirect Exchange ◽  
Copper Interlayer

In a series of NiFe/Cu/IrMn structures with variable effective thickness of the nonmagnetic copper interlayer (up to its absence in the NiFe/IrMn sample), decrease the exchange bias and coercivity caused by increase in the effective thickness of the copper layer is observed. Merger of copper islands at the 1 nm effective Cu thickness replaces direct exchange interaction between the ferromagnetic NiFe and antiferromagnetic IrMn to indirect exchange interaction provided by the conduction electrons through the copper layer NiFe-Cu-IrMn. The structural quality of single crystalline ferro- and antiferromagnetic layers does not undergo any change and magnetization reversal happens by coherent rotation of magnetization in the all analyzed temperature range 2 - 300 K. Simulation of the dynamics of Cu deposition demonstrates the island structure of the film at the initial stages up to effective thickness 1 nm.

INDIRECT EXCHANGE INTERACTION IN Hg1-xMnxTe AND Cd1-xMnxTe ALLOYS

1980 ◽  
Vol 41 (C5) ◽  
pp. C5-289-C5-292 ◽  
Author(s):  
C. Lewiner ◽  
J. A. Gaj ◽  
G. Bastard
Keyword(s):  
Exchange Interaction ◽  
Indirect Exchange Interaction ◽  
Indirect Exchange
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