Title :
Neutron depolarization in permalloy around the ferromagnetic phase transition
Author :
Stuesser, N. ; Westerhuijs, P. ; Rekveldt, M. Th
Author_Institution :
Interuniv. Reactor Inst., Delft, Netherlands
fDate :
3/1/1988 12:00:00 AM
Abstract :
The mean magnetic induction B of a permalloy specimen was determined by measuring the Larmor precession angle of a polarized neutron beam. The measurements were performed in a temperature range from Tc=-60 K to +20 K at magnetic fields up to 1150 A/cm. The temperature behavior of B with the specimen close to magnetic saturation could be fitted well by a model of a ferromagnet consisting of mutually independent grains with different phase transition temperatures. Small field-dependent depolarization was measured within a few Kelvins around Tc and is attributed to an inhomogeneous magnetization distribution caused by the spread in phase-transition temperatures.
Keywords :
Permalloy; ferromagnetic properties of substances; magnetic transitions; magnetisation; neutron diffraction examination of materials; Fe-Ni; Larmor precession angle; ferromagnet; ferromagnetic phase transition; field-dependent depolarization; inhomogeneous magnetization distribution; magnetic saturation; mean magnetic induction; mutually independent grains; neutron depolarisation; permalloy; temperature behavior; Magnetic field measurement; Magnetosphere; Neutrons; Particle beams; Phase measurement; Polarization; Saturation magnetization; Temperature dependence; Temperature distribution; Temperature measurement;
Journal_Title :
Magnetics, IEEE Transactions on
