Temperature dependence of the magnetization of canted spin structures

TY - JOUR

T1 - Temperature dependence of the magnetization of canted spin structures

AU - Jacobsen, Henrik

AU - Lefmann, Kim

AU - Brok, Erik

AU - Frandsen, Cathrine

AU - Morup, Steen

PY - 2012/9/1

Y1 - 2012/9/1

N2 - Numerous studies of the low-temperature saturation magnetization of ferrimagnetic nanoparticles and diamagnetically substituted ferrites have shown an anomalous temperature dependence. It has been suggested that this is related to freezing of canted magnetic structures. We present models for the temperature dependence of the magnetization of a simple canted spin structure in which relaxation can take place at finite temperatures between spin configurations with different canting angles. We show that the saturation magnetization may either decrease or increase with decreasing temperature, depending on the ratio of the exchange coupling constants. This is in agreement with experimental observations.

AB - Numerous studies of the low-temperature saturation magnetization of ferrimagnetic nanoparticles and diamagnetically substituted ferrites have shown an anomalous temperature dependence. It has been suggested that this is related to freezing of canted magnetic structures. We present models for the temperature dependence of the magnetization of a simple canted spin structure in which relaxation can take place at finite temperatures between spin configurations with different canting angles. We show that the saturation magnetization may either decrease or increase with decreasing temperature, depending on the ratio of the exchange coupling constants. This is in agreement with experimental observations.

U2 - 10.1016/j.jmmm.2012.05.003

DO - 10.1016/j.jmmm.2012.05.003

M3 - Journal article

SN - 0304-8853

VL - 324

SP - 3218

EP - 3222

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 19

ER -