Abstract
A method is described for preparing samples of noninteracting spherical magnetic particles with a narrow size distribution. The particles are produced using the spark erosion technique. Any conductive material, including alloys, can easily be used to produce particles with this method; electrodes of nickel are used in this study. The particles are filtered through Nuclepore filters which are suspended in an ultrasonic bath. Particles which have diameters the same as the filter pore size become trapped in the pores, forming a sample of narrowly distributed, isolated spherical particles. SEM micrographs show the distribution of particle diameters is quite narrow, with a typical standard deviation of less than 10%. Magnetization curves of nickel particles trapped in 3 μm filters have been studied. Fits of log-normal distributions of anisotropy fields to the magnetization curves in the approach to saturation have determined the mean magnetocrystalline anisotropy fields to be of the order of 2 kOe. These values are much higher than what is expected for magnetically soft spherical particles, and indicate the particles may be under some form of stress as a result of the production method.
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