Magnetic relaxation in a model of interacting nanoparticles in terms of microscopic energy barriers
作者： �scar Iglesias , Am�lcar Labarta
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摘要: Monte Carlo simulations are used to study the magnetic relaxation of a system single domain particles with dipolar interactions modeled by chain Heisenberg classical spins. We show that so-called T In (t/τ 0 ) method can be extended interacting systems and how, from computed master curves, effective energy barrier distributions responsible for obtained. A transition quasi-logarithmic power-law behavior as interaction strength is increased found. By direct computation barriers system, we this due appearance an increasing number small caused reduction anisotropy local fields increase.
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S. Sahoo, O. Petracic, W. Kleemann, S. Stappert, G. Dumpich, P. Nordblad, S. Cardoso, P. P. Freitas, Cooperative versus superparamagnetic behavior of dense magnetic nanoparticles in Co80Fe20/Al2O3 multilayers Applied Physics Letters. ,vol. 82, pp. 4116- 4118 ,(2003) , 10.1063/1.1581002
F. Luis, J. M. Torres, L. M. García, J. Bartolomé, J. Stankiewicz, F. Petroff, F. Fettar, J.-L. Maurice, A. Vaurès, Enhancement of the magnetic anisotropy of nanometer-sized Co clusters: Influence of the surface and of interparticle interactions Physical Review B. ,vol. 65, pp. 094409- ,(2002) , 10.1103/PHYSREVB.65.094409
A. Labarta, O. Iglesias, Ll. Balcells, F. Badia, Magnetic relaxation in small-particle systems: ln(t/ tau 0) scaling. Physical Review B. ,vol. 48, pp. 10240- 10246 ,(1993) , 10.1103/PHYSREVB.48.10240
Ll. Balcells, O. Iglesias, A. Labarta, Normalization factors for magnetic relaxation of small-particle systems in a nonzero magnetic field Physical Review B. ,vol. 55, pp. 8940- 8944 ,(1997) , 10.1103/PHYSREVB.55.8940
RP Cowburn, ME Welland, Room Temperature Magnetic Quantum Cellular Automata Science. ,vol. 287, pp. 1466- 1468 ,(2000) , 10.1126/SCIENCE.287.5457.1466
E Tronc, D Fiorani, M Noguès, A.M Testa, F Lucari, F D’Orazio, J.M Grenèche, W Wernsdorfer, N Galvez, C Chanéac, D Mailly, J.P Jolivet, Surface effects in noninteracting and interacting γ-Fe2O3 nanoparticles Journal of Magnetism and Magnetic Materials. ,vol. 262, pp. 6- 14 ,(2003) , 10.1016/S0304-8853(03)00011-8
L. C. Sampaio, R. Hyndman, F. S. de Menezes, J. P. Jamet, P. Meyer, J. Gierak, C. Chappert, V. Mathet, J. Ferré, Power-law relaxation decay in two-dimensional arrays of magnetic dots interacting by long-range dipole-dipole interactions Physical Review B. ,vol. 64, pp. 184440- ,(2001) , 10.1103/PHYSREVB.64.184440
Xi Chen, W. Kleemann, O. Petracic, O. Sichelschmidt, S. Cardoso, P. P. Freitas, Relaxation and aging of a superferromagnetic domain state Physical Review B. ,vol. 68, pp. 054433- ,(2003) , 10.1103/PHYSREVB.68.054433
R. Hyndman, A. Mougin, L.C. Sampaio, J. Ferré, J.P. Jamet, P. Meyer, V. Mathet, C. Chappert, D. Mailly, J. Gierak, Magnetization reversal in weakly coupled magnetic patterns Journal of Magnetism and Magnetic Materials. ,vol. 240, pp. 34- 36 ,(2002) , 10.1016/S0304-8853(01)00721-1
R. Ribas, A. Labarta, Magnetic relaxation of a one‐dimensional model for small particle systems with dipolar interaction: Monte Carlo simulation Journal of Applied Physics. ,vol. 80, pp. 5192- 5199 ,(1996) , 10.1063/1.363502