Zobrazeno 1 - 10
of 29
pro vyhledávání: '"Castro, J. d'Albuquerque e"'
Publikováno v:
Physical Review B 71 (9), 094435 (2005)
A detailed investigation of the scaling relations recently proposed by [J. d'Albuquerque e Castro, D. Altbir, J. C. Retamal, and P. Vargas, Phys. Rev. Lett. 88, 237202 (2002)] to study the magnetic properties of nanoparticles is presented. Analytical
Externí odkaz:
http://arxiv.org/abs/1106.3382
Publikováno v:
Applied Physics Letters 82 (20), 3478-3480 (2003)
The magnetic behavior of truncated conical nanoparticles in patterned thin films is investigated as a function of their size and shape. Using a scaling technique, phase diagrams giving the relative stability of characteristic internal magnetic struct
Externí odkaz:
http://arxiv.org/abs/1106.2868
Publikováno v:
Applied Physics Letters 94,032505,2009
The temperature dependence of the static magnetic susceptibility of exchange-disordered antiferromagnetic Heisenberg spin-1/2 finite chains with an odd number of spins is investigated as a function of size and type of disorder in the exchange couplin
Externí odkaz:
http://arxiv.org/abs/0901.4317
Publikováno v:
Phys. Rev. B 75 (2007) 235445
Due to their focalizing properties, elliptic quantum corrals present very interesting physical behaviors. In this work, we analyze static and dynamical properties of these systems. Results are presented for realistic values of the parameters, which m
Externí odkaz:
http://arxiv.org/abs/0807.1146
Publikováno v:
Phys. Rev. B 78, 035102 (2008)
The diffusion of electronic wave packets in one-dimensional systems with on-site, binary disorder is numerically investigated within the framework of a single-band tight-binding model. Fractal properties are incorporated by assuming that the distribu
Externí odkaz:
http://arxiv.org/abs/0801.0513
The relative stability of the vortex, onion and ferromagnetic phases in nanorings is examined as a function of the ring geometry. Total energy calculations are carried out analytically, based on simple models for each configuration. Results are summa
Externí odkaz:
http://arxiv.org/abs/cond-mat/0608037
Autor:
Chaves, C. M., Paiva, Thereza, Castro, J. d'Albuquerque e, Hebert, F., Scalettar, R. T., Batrouni, G. G., Koiller, Belita
Publikováno v:
Phys. Rev. B 73, 104410 (2006)
The low-temperature behavior of the static magnetic susceptibility $\chi(T)$ of exchange-disordered antiferromagnetic spin chains is investigated. It is shown that for a relatively small and even number of spins in the chain, two exchange distributio
Externí odkaz:
http://arxiv.org/abs/cond-mat/0507246
We have studied the magnetic-field and concentration dependences of the magnetizations of the hole and Mn subsystems in diluted ferromagnetic semiconductor Ga_{1-x}Mn_xAs. A mean-field approximation to the hole-mediated interaction is used, in which
Externí odkaz:
http://arxiv.org/abs/cond-mat/0301184
Publikováno v:
J Phys: Condensed Matter 14, 3751 (2002)
We consider a mean-field approach to the hole-mediated ferromagnetism in III-V Mn-based semiconductor compounds to discuss the dependence of the hole density on that of Mn sites in Ga_{1-x}Mn_xAs. The hole concentration, p, as a function of the fract
Externí odkaz:
http://arxiv.org/abs/cond-mat/0108245
It is shown that the coupling between magnetic layers separated by non-magnetic metallic superlattices can decay exponentially as a function of the spacer thickness $N$, as opposed to the usual $N^{-2}$ decay. This effect is due to the lack of constr
Externí odkaz:
http://arxiv.org/abs/cond-mat/9807182