First-principles study of ultrafast magneto-optical switching in NiO

Lefkidis, Georgios; Hübner, Wolfgang

doi:10.1103/physrevb.76.014418

Cited by 69 publications

(49 citation statements)

References 18 publications

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“…First the highly correlated electronic structure of the system is obtained on a nonrelativistic level with the use of the symmetry-adapted cluster configuration-interaction method ͑SAC-CI͒ of Nakatsuji et al 19 incorporated in the GAUSSIAN 03 package. 20 Then SOC and an external static magnetic field are added by means of time-independent perturbation theory and finally the laser pulse is turned on as a time-dependent perturbation ͑semiclassical model͒; integration over time is done with the fifth order Runge-Kutta method and CashKarp adaptive step size control ͑see previous works [13][14][15] ͒. The expectation values of the various operators are calculated with the reduced-density-matrix formalism in order to determine their spatial localization as well.…”

Section: Theory and Resultsmentioning

confidence: 99%

“…In previous works we have shown the possibility of local all-optical spin switching, i.e., the explicit addressing and local manipulation of the spins of a NiO cluster embedded in a well-defined chemical environment [13][14][15] and two-magneticcenter metallic chains. 16,17 In this paper we extend this idea further by including more magnetic centers so that an alloptical spin transfer as an additional scenario can be realized along with the local spin-switching mechanism, thus leading to an enhanced functionality.…”

Section: Magnetic Logicmentioning

confidence: 99%

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Optical spin manipulation for minimal magnetic logic operations in metallic three-center magnetic clusters

2009

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Section: Theory and Resultsmentioning

confidence: 99%

Section: Magnetic Logicmentioning

confidence: 99%

Optical spin manipulation for minimal magnetic logic operations in metallic three-center magnetic clusters

2009

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“…In order to properly describe the laser-matter interaction, as demonstrated in previous works, 12,13,16 the Hamiltonian of the interacting system is solved in the following three steps: The first step is to solve the Hamiltonian of a magnetic …”

Section: Theory and Technical Detailsmentioning

confidence: 99%

“…12 There is a difference between spin-flip and spin-transfer processes. In the former case, the anisotropy of the molecule influences the spin orientation and then the laser pulse needs to be tilted with respect to the spin.…”

mentioning

confidence: 99%

Theory of laser-induced ultrafast magneto-optic spin flip and transfer in charged two-magnetic-center molecular ions: Role of bridging atoms

Jin

Xiang

et al. 2011

Phys. Rev. B

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Laser-induced ultrafast spin manipulations in positively charged two-magnetic-center molecular ions with a small number of bridging atoms are investigated to explore the role of bridging atoms in the spin switching process and spin transferability between the magnetic centers via the Λ process. Taking O and Mg as examples for bridging atoms, fully ab initio calculations demonstrate that spin flip can be readily achieved on subpicosecond time scales at both magnetic centers of the linear structures composed of two nonidentical magnetic atoms with a single bridging atom in between. Although these two nonmagnetic elements possess completely different chemical and electronic natures, both types of bridging atoms contribute to spin density redistribution at the magnetic atoms, especially for the low-lying triplet states that are suitable to act as initial and final states in the Λ-type process of spin flip or transfer. This also provides a rule-of-thumb that spins in the linear structures can be flipped more easily since symmetric structures exhibit weaker magnetocrystalline anisotropy. The spin transfer process achieved in the structure [Fe-O(Mg)-Co] + demonstrates that if both bridging atoms are involved to further lower the symmetry of the linear structures, spin transferability between the Fe and Co atoms can be improved.

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“…In order to properly describe the laser-matter interaction, as demonstrated in previous works [8,9], the Hamiltonian of the interacting system is solved in two steps. The first step is to solve the time-independent Hamiltonian in a static magnetic field B stat :…”

Section: Methods and Technical Detailsmentioning

confidence: 99%

First-principles calculation of monitoring spin states of small magnetic nanostructures with IR spectrum of CO

Lefkidis

Hübner

2010

J. Phys.: Conf. Ser.

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Abstract. A fully ab initio controlled ultrafast magnetooptical switching mechanism in small magnetic clusters is achieved through exploiting spin-orbit-coupling enabled Λ processes. The idea is that in the magnetic molecules a fast transition between two almost degenerate states with different spins can be triggered by a laser pulse, which leads to an electron excitation from one of the degenerate states to a highly spin-mixed state and a deexcitation to the state of opposite spin. In this paper a CO molecule is attached to one magnetic center of the clusters, which serves as an experimental marker to map the laser-induced spin manipulation to the IR spectrum of CO. The predicted spin-state-dependent CO frequencies can facilitate experimental monitoring of the processes. We show that spin flip in magnetic atoms can be achieved in structurally optimized magnetic clusters in a subpicosecond regime with linearly polarized light. IntroductionIn recent years there has been a continuous strain to increase the storage capacity as well as to minimize as much as possible the time needed to record data on magnetic materials. However, the tremendous increase in the storage density and read-write speed in magnetic storage media is reaching its physical limits. Manipulation of the spin degree of freedom is attracting more and more attention due to its potential to increase the information density and speed in computational device applications. Many light-driven scenarios and mechanisms of demagnetization have already been proposed [1,2,3], and it has been demonstrated that subpicosecond magnetic switching can be achieved by exploiting the ultrafast electron-photon interaction [4,5]. Laser manipulation has been well understood in atomic and molecular systems, which stimulates the implementation of these mechanisms in practical device applications.At the same time, monitoring spin manipulation is another important and necessary aspect in device realization. Although it is possible to theoretically predict the spin state of matter, it is still one of the significant problems that experiment will encounter. Here a possible solution to this problem is proposed. We use a CO molecule as an experimental marker attached to the investigated magnetic clusters. The CO marker changes the electronic structure of the magnetic cluster only minimally, however it lowers its symmetry. If certain magnetic states of the cluster correspond to specific CO vibrational frequencies, experiment can reveal the spin state indirectly from the infrared (IR) spectrum of CO, which is a common and reliable technique in experiment.

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First-principles study of ultrafast magneto-optical switching in NiO

Cited by 69 publications

References 18 publications

Optical spin manipulation for minimal magnetic logic operations in metallic three-center magnetic clusters

Optical spin manipulation for minimal magnetic logic operations in metallic three-center magnetic clusters

Theory of laser-induced ultrafast magneto-optic spin flip and transfer in charged two-magnetic-center molecular ions: Role of bridging atoms

First-principles calculation of monitoring spin states of small magnetic nanostructures with IR spectrum of CO

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