By K.H.J. Buschow
In my ongoing evaluate of the literature during this topic quarter, I had this ebook pulled via the library. permit me get the dangers of this assessment out of how first. The writing kind basically means that the booklet could have been collated from path lecture notes and fabric. In lectures, fabric is gifted as part of a lecture, with loads of spoken phrases so as to add rationalization and feeling to densely written notes. therefore, the publication is densely choked with details, and a bit additional textual content to aid clarify issues might have made issues extra readable. this can be a ordinary sin in specialized-subject graduate-level texts.
On the confident aspect, this publication covers a superb volume of floor in loads of theoretical aspect. to offer an concept as to what's lined, listed here are the bankruptcy titles:
1. creation 2. The foundation of Atomic Moments three. Paramagnetism of loose Ions four. The Magnetically Ordered kingdom five. Crystal Fields 6. Diamagnetism 7. Itinerant-Electron Magnetism eight. a few uncomplicated recommendations and devices nine. dimension options 10. Caloric results in Magnetic fabrics eleven. Magnetic Anisotropy 12. everlasting Magnets thirteen. High-Density Recording fabrics 14. smooth Magnetic fabrics 15. Invar Alloys sixteen. Magnetostrictive Materials
Given what my box is, i used to be pleasantly shocked to discover notes at the production approach for NdFeB everlasting magnets. The discussions on area phenomena appeared entire and valuable. All in all, the theoretical method of the subject material provides the publication even more of a physicist's believe, instead of the simpler think of an engineer.
This appears to be like a superb reference at the subject material.
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In my ongoing overview of the literature during this topic zone, I had this ebook pulled via the library. permit me get the disadvantages of this evaluate out of how first. The writing variety essentially means that the e-book can have been collated from path lecture notes and fabric. In lectures, fabric is gifted as part of a lecture, with loads of spoken phrases so as to add rationalization and feeling to densely written notes.
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Extra resources for Physics of Magnetism and Magnetic Materials
Therefore, the crystal–field calculations can be made by leaving as basis set. the electron spin out of consideration and using the wave functions When calculating the matrix elements of the Hamiltonian given in Eq. 7), one has to bear in mind that only even values of n need to be retained. It can also be shown that terms with n > 2l vanish (l = 2 for 3d electrons). As an example, let us consider the crystal-field potential due to a sixfold cubic (or octahedral) coordination. Owing to the presence of fourfold-symmetry axes, only terms with n = 4 and m = 0, ± 4 are retained, which leads to where the coefficients of the terms have been calculated with the help of Eq.
2). CHAPTER 4. THE MAGNETICALLY ORDERED STATE 30 We will now consider the susceptibility of an antiferromagnetic single crystal with the magnetic field applied perpendicular to the easy direction. The applied field will then produce a torque that will bend the two sublattice moments away from the easy direction, as is schematically shown in the inset of Fig. 2. This process is opposed by the molecular field that tries to keep the two sublattice moments antiparallel. The total torque on each sublattice moment must be zero when an equilibrium position is reached after application of the magnetic field.
Such a direction is called the easy magnetization direction. When describing the temperature dependence of the magnetization or susceptibility at tem we have to distinguish two separate cases, depending on whether the peratures below measuring field is applied parallel or perpendicular to the easy magnetization direction of the two sublattice moments. As can be seen from Fig. 2, the magnetic response in these two directions is strikingly different. We will first consider the case where the field is applied parallel to the easy magneti zation direction in an antiferromagnetic single crystal, with H parallel to the A-sublattice magnetization and antiparallel to the B-sublattice magnetization.