Title :
Influence of particle size on the magnetic viscosity and activation volume of α-Fe nanowires in alumite films
Author :
Li, Feiyue ; Metzger, Robert M. ; Doyle, W.D.
Author_Institution :
Dept. of Chem., Alabama Univ., Tuscaloosa, AL, USA
fDate :
9/1/1997 12:00:00 AM
Abstract :
Particle size effects on the magnetic viscosity and activation volume were studied at room temperature for elongated α-Fe particles in alumite (Fe nanowires in an anodized aluminum oxide film). Both magnetic viscosity and activation volume are strongly dependent on the particle diameter, but independent of the particle length. The magnetization reversal mechanism of elongated α-Fe particles in alumite films is discussed. The activation volume may represent the size of the magnetic switching unit propagating along the particle length during the non-uniform magnetization reversal
Keywords :
alumina; ferromagnetic materials; iron; magnetic particles; magnetic permeability; magnetisation reversal; particle size; α-Fe nanowires; AlO; Fe; activation volume; alumite films; anodized aluminum oxide film; magnetic switching unit; magnetic viscosity; magnetization reversal mechanism; non-uniform magnetization reversal; particle diameter; particle length; particle size; Fluctuations; Iron; Magnetic anisotropy; Magnetic films; Magnetic recording; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Saturation magnetization; Temperature; Viscosity;
Journal_Title :
Magnetics, IEEE Transactions on
