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91.
We calculate the contribution of the Néel surface anisotropy to the effective anisotropy of magnetic nanoparticles of spherical shape cut out of a simple cubic lattice. The effective anisotropy arises because deviations of atomic magnetizations from collinearity and thus the energy depends on the orientation of the global magnetization. The result is second order in the Néel surface anisotropy, scales with the particle's volume, and has cubic symmetry with preferred directions [+/- 1, +/-1 , +/-1]. 相似文献
92.
93.
94.
The modified version of the spin operator diagram technique is presented with regard to the dynamical properties of the easy-plane ferromagnets. The non-interacting spin wave (SW) spectrum and scattering amplitudes are obtained with the help of the spin Hamiltonian diagonalization procedure8). The SW relaxation frequencies due to the processes of the SW scattering on each other and on the longitudinal spin components thermal fluctuations are calculated. 相似文献
95.
96.
S. F. Garanin 《Russian Physics Journal》1984,27(2):156-160
A method for calculating a shell correction to total atomic energy within the framework of statistical theory is proposed. It is shown that the shell correction which defines the energy component which oscillates with Z is of the relative order of magntiude Z–1. The results obtained agree well with calculations by the Hartree-Fock method.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 81–86, February, 1984. 相似文献
97.
98.
99.
D. A. Garanin 《Journal of statistical physics》1996,83(5-6):907-931
The field-dependent magnetizationm(H, T) of one- and two-dimensional classical magnets described by theD-component vector model is calculated analytically in the whole range of temperature and magnetic fields with the help of the 1/D expansion. In the first order in 1/D the theory reproduces with a good accuracy the temperature dependence of the zero-field susceptibility of antiferromagnets with maximum atT|J
0|/D (J
0 is the Fourier component of the exchange interaction) and describes for the first time the singular behavior of (H, T) at small temperatures and magnetic fields: lim
T0 lim
H0 (H, T)=1/(2|J
0|)(1–1/D) and lim
H0 lim
T0 (H, T)=1/(2|J
0|). 相似文献
100.
A. Caruso N. N. Demchenko V. V. Demchenko S. G. Garanin V. V. Gavrilov A. Yu. Gol'tsov A. I. Gromov S. Yu. Gus'kov Yu. S. Kas'yanov G. A. Kirillov V. N. Kondrashov N. G. Koval'skii I. G. Lebo Yu. A. Merkul'ev V. V. Nikishin V. B. Rozanov A. A. Rupasov R. V. Stepanov C. Strangio S. A. Sukharev V. F. Tishkin G. A. Vergunova N. V. Zmitrenko 《Journal of Russian Laser Research》2000,21(4):335-369
The paper is devoted to recent results concerning investigation of physical processes occurring in a “laser greenhouse” target.
Results of experimental and theoretical studies of laser-pulse interaction with a low-density absorber of the target, namely,
with a porous substance having density close to the plasma critical density, are presented. On the basis of a vast cycle of
experiments carried out in a number of laboratories, it is shown that the absorption of the laser radiation in porous media,
including those with a density exceeding the critical one by at least a factor of 4 to 6, has a bulk nature and is distributed
over the target depth. In particular, the laser-radiation absorption region in a porous substance with density 10−3–10−2 g/cm3 is extended into the target 400–100 μm, respectively. The coefficient of absorption of laser radiation with intensity 1014–1015 W/cm2 in porous substances, including those of the supercritical density, is 70–90%. Experiments have not shown enhanced (compared
to a solid-state target) radiation intensity associated with a possible development of parametric instabilities in an extended
laser plasma of low-density porous media, as well as noticeable contribution of fast electrons to the energy balance and their
effect on the energy transfer. In this paper, theoretical models are developed explaining features of the laser-radiation
absorption and energy transfer in porous media. These models are based on the phenomenon of laser-radiation interaction with
solid components of a porous substance and plasma production inside pores and cells of the medium. The efficiency of energy
conversion in the vicinity of the ignition threshold for the laser-greenhouse target is investigated in the case of an absorber
having the above properties. Numerical calculations have shown that a thermonuclear-gain coefficient of 1 to 2 (with respect
to the energy absorbed) is attained for a laser-radiation energy of 100 kJ.
Translated from Preprint No. 58 of the P. N. Lebedev Physical Institute, Moscow (1999). 相似文献