Magnetic Hysteresis in Novel Magnetic Materials by Amikam Aharoni (auth.), George C. Hadjipanayis (eds.)

By Amikam Aharoni (auth.), George C. Hadjipanayis (eds.)

A precise presentation of the physics of many of the hysteresis types which are presently used to give an explanation for the magnetization reversal procedure, together with coherent and incoherent magnetization techniques, micromagnetism and its software in skinny movies, multilayers, nanowires, debris and bulk magnets, area wall pinning and area wall dynamics, and Preisach modelling. the various defective thoughts and interpretations that also exist within the literature are rectified. Magnetic imaging recommendations are reviewed, together with TEM, SEM, magnetic strength microscopy, and optical microscopy. Temperature, box and angular dependence of coercivity, magnetic interactions and magnetic phenomena are reviewed and their impact on magnetic hysteresis is mentioned. The magnetic homes of novel fabrics are mentioned, together with nanoparticles, nanocrystalline granular solids, particulate media, skinny motion pictures, and bulk magnets. ultimately, current and destiny purposes of novel fabrics are awarded, together with magnetic and magneto-optic recording media, magneto-electronics, sensors, magnetic circuit layout, and novel buildings produced from inflexible, high-energy everlasting magnets.

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V. Berkov, J. Magn. Magn. Mater. N. TROHIDOU1, JA. BLACKMAN2 andD. Box 220, Reading RG6 2AF,UK ° 1Institute Abstract. We study the aggregation process of small magnetic particles simulating the situation that occurs in the evaporation deposition technique on a two-dimensional substrate. Monte Carlo simulations are used and the particles interact via dipolar interactions. We characterise the clusters produced in the aggregation process by a fractal dimensionality. We show that there is a simple relation between the magnetisation and the fractal dimensionality.

Generally, the particles will be coated with a surfactant in order to achieve colloidal stability. The simplest colloidal dispersions are ferrofluids dispersions of '" 10nm particles in a variety of media. In the context of the current paper ferrofluids are interesting because they can be produced in carriers which can be polymerised, resulting in a well dispersed 'model' fine particle system. The other class of dispersions of interest is that forming the precursor of particulate recording media.

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