Barco, Enrique del, 1968-Hernández Ferràs, Joan ManelSales i Pardo, MartaTejada Palacios, JavierChudnovsky, Eugene M., 1948-Broto, Jean-MarcRakoto, H.2009-12-292009-12-2919990163-1829https://hdl.handle.net/2445/10661We report experimental studies and suggest a quantitative model of spin relaxation in Mn12 acetate in a pulsed magnetic field in the temperature range 1.95.0 K. When the field applied along the anisotropy axis is swept at 140 T/s through a nonmagnetized Mn12 acetate sample, the samples magnetization switches, within a few milliseconds, from zero to saturation at a well-defined field whose value depends on temperature but is quantized in units of 0.46 T. A quantitative explanation of the effect is given in terms of a spin-phonon avalanche combined with thermally assisted resonant spin tunneling.4 p.application/pdfeng(c) The American Physical Society, 1999Materials magnèticsRelaxació magnèticaPropietats magnètiquesSpin (Física nuclear)Magnetic materialsMagnetic relaxationSpin (Nuclear physics)Magnetic propertiesinfo:eu-repo/semantics/article143191info:eu-repo/semantics/openAccess