Optimal conditions for magnetization reversal of nanocluster assemblies with random properties

Kharebov, P.V.; Henner, V. K.; Yukalov, V. I.

doi:10.1063/1.4788766

Cited by 12 publications

(8 citation statements)

References 32 publications

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“…These equations have been analyzed for polarized molecules [11-15, 25, 27], magnetic nanomolecules [25,[28][29][30][31][32], and for magnetic nanoclusters [26,33,34]. The results obtained by the scale separation approach [11][12][13][14][15]25] have been compared with direct numerical simulations [35][36][37] of the evolution equations for spins, both ways being in good agreement with each other.…”

Section: Magnetic Nanoclustersmentioning

confidence: 91%

Coherent radiation by quantum dots and magnetic nanoclusters

Yukalov¹,

Yukalova²

2014

AIP Conference Proceedings

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Abstract. The assemblies of either quantum dots or magnetic nanoclusters are studied. It is shown that such assemblies can produce coherent radiation. A method is developed for solving the systems of nonlinear equations describing the dynamics of such assemblies. The method is shown to be general and applicable to systems of different physical nature. Despite mathematical similarities of dynamical equations, the physics of the processes for quantum dots and magnetic nanoclusters is rather different. In a quantum dot assembly, coherence develops due to the Dicke effect of dot interactions through the common radiation field. For a system of magnetic clusters, coherence in the spin motion appears due to the Purcell effect caused by the feedback action of a resonator. Self-organized coherent spin radiation cannot arise without a resonator. This principal difference is connected with the different physical nature of dipole forces between the objects. Effective dipole interactions between the radiating quantum dots, appearing due to photon exchange, collectivize the dot radiation. While the dipolar spin interactions exist from the beginning, yet before radiation, and on the contrary, they dephase spin motion, thus destroying the coherence of moving spins. In addition, quantum dot radiation exhibits turbulent photon filamentation that is absent for radiating spins.

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Section: Magnetic Nanoclustersmentioning

confidence: 91%

Coherent radiation by quantum dots and magnetic nanoclusters

Yukalov¹,

Yukalova²

2014

AIP Conference Proceedings

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“…Anyway, this is a rather large quantity comparable or even larger than the characteristic dipolar interaction energy ρµ 2 S , where ρ is the average atomic density. The mean interatomic distance in optical lattices is of the order a ∼ (10 Hamiltonian (3.106) has the structure similar to that of the system of magnetic nanomolecules and magnetic nanoclusters [112,[125][126][127][128][129], with the quadratic Zeeman term analogous to the singlesite anisotropy. Therefore the spin dynamics for this Hamiltonian can be studied in the same way as in the cited papers.…”

Section: Spin Dynamicsmentioning

confidence: 98%

Dipolar and spinor bosonic systems

Yukalov

2018

Laser Phys.

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The main properties and methods of describing dipolar and spinor atomic systems, composed of bosonic atoms or molecules, are reviewed. The general approach for the correct treatment of Bose-condensed atomic systems with nonlocal interaction potentials is explained. The approach is applied to Bose-condensed systems with dipolar interaction potentials. The properties of systems with spinor interaction potentials are described. Trapped atoms and atoms in optical lattices are considered. Effective spin Hamiltonians for atoms in optical lattices are derived. The possibility of spintronics with cold atom is emphasized. The present review differs from the previous review articles by concentrating on a thorough presentation of basic theoretical points, helping the reader to better follow mathematical details and to make clearer physical conclusions.Cold atomic and molecular bosonic systems have recently been the objects of intensive research, both experimental and theoretical. First, the attention has been concentrated on dilute systems, composed of particles characterized by local interaction potentials, independent of spins, whose properties are well described by the s-wave scattering length. There are several books [1-4] and review articles [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] covering different aspects of such bosonic systems with spin-independent local interaction potentials.In the present review, bosonic atoms or molecules are treated interacting through nonlocal interaction potentials, such as dipolar potential, and interacting through spinor forces that are local but depending on the effective spins related to hyperfine states. Although there exist reviews devoted to dipolar [20][21][22][23][24][25] and spinor [26,27] systems (see also [3,28]) the present paper differs from them in the following aspects. First, our aim here is not a brief enumeration of particular cases, numerical calculations, and different experiments, but the attention here is concentrated on the principal theoretical points allowing for the correct treatment of dipolar and spinor systems. Second, more attention is payed to the derivation of effective spin Hamiltonians for atoms and molecules in optical lattices. Third, the possibility of spintronics with cold atoms and molecules, interacting through dipolar and spinor forces, is discussed.The exposition of the material is organized so that the main mathematical points be clear to the reader. More technical details can be found in the tutorials [29,30]. Throughout the paper, the system of units is employed where the Boltzmann and Planck constants are set to one, k B = 1 and = 1.As is evident, the equation for the vacuum coherent field (2.40) differs form the equation (2.34) for the condensate function that is a coherent field, but, generally, not the vacuum coherent field. Equation (2.40) is a particular case of (2.34), where there are no uncondensed particles, so that ρ 1 , σ 1 , as well as ξ, are zero.One often confuses equation (2.40) for the vacuum coherent field with me...

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“…While nanomolecules of the same chemical structure are identical with each other and can form perfect crystalline lattices. However, the nonuniformity of nanoclusters does not preclude the possibility of their spin correlations by the resonator feedback field [28].…”

Section: Magnetic Nanomolecules and Nanoclustersmentioning

confidence: 99%

Spintronics with Magnetic Nanomolecules and Graphene Flakes

Yukalov

Henner

Belozerova

et al. 2015

J Supercond Nov Magn

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We show how the magnetization of nano-objects can be efficiently regulated. Several types of nanosystems are considered: magnetics nanomolecules, magnetic nanoclusters, polarized nanomolecules, and magnetic graphene. These nano-objects and the structures composed of them enjoy many common properties, with the main difference being in the type of particle interactions. The possibility of governing spin dynamics is important for spintronics.

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Optimal conditions for magnetization reversal of nanocluster assemblies with random properties

Cited by 12 publications

References 32 publications

Coherent radiation by quantum dots and magnetic nanoclusters

Coherent radiation by quantum dots and magnetic nanoclusters

Dipolar and spinor bosonic systems

Spintronics with Magnetic Nanomolecules and Graphene Flakes

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