Download Magnetism and Synchrotron Radiation: Towards the Fourth by Robert L. Stamps (auth.), Eric Beaurepaire, Hervé Bulou, PDF

By Robert L. Stamps (auth.), Eric Beaurepaire, Hervé Bulou, Loic Joly, Fabrice Scheurer (eds.)

Advances within the synthesis of recent fabrics with usually complicated, nano-scaled buildings require more and more refined experimental options that may probe the digital states, the atomic magnetic moments and the magnetic microstructures chargeable for the houses of those materials.

At an analogous time, growth in synchrotron radiation recommendations has ensured that those mild assets stay a key device of research, e.g. synchrotron radiation assets of the 3rd new release may be able to aid magnetic imaging on a sub-micrometer scale.

With the 6th Mittelwihr university on Magnetism and Synchrotron Radiation the culture of training the state of the art on glossy learn advancements maintains and is expressed throughout the current set of intensive lectures supplied during this quantity. whereas essentially geared toward postgraduate scholars and newbies to the sphere, this quantity also will profit researchers and teachers actively operating within the field.

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Extra resources for Magnetism and Synchrotron Radiation: Towards the Fourth Generation Light Sources: Proceedings of the 6th International School “Synchrotron Radiation and Magnetism”, Mittelwihr (France), 2012

Example text

An example is shown in Fig. 16. An elliptical dot of soft material is modelled by a single block spin. The geometry in used to define an easy direction in the plane: Shape anisotropies align the magnetization in plane along the major axis, and are represented by uniaxial anisotropies in the effective fields. A static field is applied opposite to the initial magnetization. A pulsed field is applied at an oblique angle to the moment, causing a precessional reversal. The length of the pulse is greater than the relaxation time.

2 Thermally driven reversal Thermal fluctuations can also serve to drive reversal. In N´eel’s fluctuation model, one imagines that a moment experiences instantaneous effective magnetic fields that are random in orientation and magnitude, with a distribution that depends upon temperature. This is described by a random vector field h f included in the torque equations of motion. Fig. 17 The success of creating reversal using a pulse much shorter than the characteristic relaxation time depends sensitively on field magnitude and orientation.

A solution for M = 0 always exists, but an additional solution for M > 0 exists for temperatures between T = 0 and T = Tm f , where Tm f is the critical temperature corresponding to TC in the Curie theory. The theory can be generalised to larger J values as before, with the result that self consistent equation now has the form M = NgµB JBJ gµB λ M kB T . 40) Solutions for M for different values of J are shown in Fig. 6. Note that the critical temperature is determined by Jex , not the angular momentum number J.

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