TITLE:
Bose-Einstein Condensation of Confined Magnons in Nanostructures
AUTHORS:
Lawrence H. Bennett, Edward Della Torre
KEYWORDS:
Bose-Einstein Statistics, Aftereffect, Bloch T3/2 Law, Chemical Potential, Arrhenius Law
JOURNAL NAME:
Journal of Modern Physics,
Vol.5 No.8,
May
30,
2014
ABSTRACT: A number
of diverse kinds of magnetic experiments are shown to lead to the observation
of a Bose-Einstein condensation of magnons in some nanostructures, especially
in Fe and in Co/Pt. The experiments include 1) the measurement of magnetic
aftereffect, 2) measurements of Néel’s fluctuation field, including an estimate
of activation volume, 3) the measurement of the energy gap which provides a
lower limit on the BEC temperature, 4) using Lagrange multipliers in the quantum
thermodynamics of magnons, and 5) the observation of a visible anomaly in the
Bloch T3/2 law for the temperature dependence of magnetization of nanostructured
ferromagnets.