Super spin dimensionality of a mono-dispersed and densely packed magnetic nanoparticle system

8th International Conference on Fine Particle Magnetism

Andersson, M.S.^1 ; De Toro, J.A.^2 ; Lee, S.S.^3 ; Mathieu, R.^1 ; Nordblad, P.^1

Department of Engineering Sciences, Uppsala University, Box 534, SE-751 21 Uppsala, Sweden^1

Instituto Regional de Investigación Científica Aplicada (IRICA), Departamento de Fisica Aplicada, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain^2

Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, The Nanos, Singapore 138669, Singapore^3

关键词: Constant temperature;    Lower temperatures;    Maghemite nanoparticle;    Magnetic nano-particles;    Remnant magnetization;    Temperature dependence;    Temporal applications;    Weak magnetic fields;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/521/1/012012/pdf
DOI  :  10.1088/1742-6596/521/1/012012

来源: IOP

【 摘 要 】

The dynamics of a dense near mono-dispersed assembly of maghemite nanoparticles is investigated by measurements of the temperature dependence of the isothermal remnant magnetization induced by temporal application of weak magnetic fields at constant temperature. The results suggest that the dimensionality of the super spins of the particles is of Heisenberg character at high temperatures but crossover to become Ising like at lower temperatures.