Download Microwave Propagation in Ferrimagnetics by M. S. Sodha, N. C. Srivastava PDF

By M. S. Sodha, N. C. Srivastava

During the final 3 a long time, curiosity within the box of interplay of microwaves with ferrimagnetics has gradually elevated. Investigations in tlris box have ended in the improvement of a couple of units used for quite a few functions. The preliminary emphasis of the investigators used to be at the microwave habit of ferrimagnetics positioned in cavities and steel waveguides and linked units. This paintings has been offered in quite a few books, monographs, and stories written throughout the sixties. lately, curiosity in microwave propagation in ferrimagnetics has shifted from loaded waveguides to quite new components, e. g. , magnetostatic and magnetoelastic waves in layered buildings, microwave propagation in ferrimagnetic strip strains and microstrips, and so forth. Such investigations are very important from the perspective of units corresponding to hold up traces, filters, convolvers, guided wave amplifiers, striplines, and microstrip section shif­ ters, circulators, facet guided mode isolators, and so on. As such, we feit the necessity for a textual content (meant for graduate scholars beginning paintings in those parts as weil as training electric engineers and utilized physicists) which offers a coherent account of a number of the facets of propagation of microwaves (electromagnetic as weil as magnetoelastic) in biased ferrimagnetics and discusses the particularly fresh advancements within the conception and operation of the aforementioned units, and this e-book is the end result. A biased ferrimagnetic is, within the mathematical experience, a classy medium, electromagnetically as weil as elastically.

Show description

Read Online or Download Microwave Propagation in Ferrimagnetics PDF

Similar magnetism books

Physics of Magnetism and Magnetic Materials

In my ongoing evaluation of the literature during this topic zone, I had this booklet pulled by way of the library. allow me get the hazards of this evaluation out of how first. The writing type basically means that the e-book 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 clarification and feeling to densely written notes.

Magnetism and Structure in Functional Materials (Springer Series in Materials Science)

Magnetism and constitution in practical fabrics addresses 3 special yet similar subject matters: (i) magnetoelastic fabrics corresponding to magnetic martensites and magnetic form reminiscence alloys, (ii) the magnetocaloric impression concerning magnetostructural transitions, and (iii) gigantic magnetoresistance (CMR) and similar manganites.

Strongly Interacting Matter in Magnetic Fields

The physics of strongly interacting subject in an exterior magnetic box is shortly rising as a subject matter of serious cross-disciplinary curiosity for particle, nuclear, astro- and condensed topic physicists. it's recognized that powerful magnetic fields are created in heavy ion collisions, an perception that has made it attainable to check numerous awesome and interesting phenomena that emerge from the interaction of quantum anomalies, the topology of non-Abelian gauge fields, and the magnetic box.

Liquid-quenched Alloys

Quantity 19 of crew III (Crystal and stable country Physics) bargains with the magnetic homes of metals, alloys and steel compounds. the quantity of data on hand during this box is so mammoth that numerous subvolumes are had to conceal all of it. Subvolumes III/19a via III/19f deal with the intrinsic magnetic homes, i.

Additional info for Microwave Propagation in Ferrimagnetics

Sample text

Sec. 45). 46) is widely applicable. 45). 42) may be valid. 14) so as to make the latter applicable in Situations where magnetization is spatially nonuniform (spin wave). The explicit effect of exchange interaction on a permeability tensor can be examined by studying the variation of the oscillating part of the magnetization m as exp j ( wt - k · r ), where k = ßn. 25). The only modification on account of the exchange term is that, in the expressions for p. 38 X 10- 16 erg/deg K. Since Tc, the critical temperature, is about l000°K for a typical ferrimagnetic material, we have Hw = 107 Oe.

Consequently, each spin experiences a torque which tends to orient it parallel to the neighboring spins. We will now derive§ an expression for this torque, called exchange torque. • A simple derivation has been given by Feynman (1972). ' Incidently, even when the overlap integral is small, the magnetic order occurs at sufficiently Iow temperatures, where the thermal agitation does not dominate over the magnetic order. arge. ' The exchange interaction is a short-range interaction. • The present derivation is by no means rigorous; it has been carried out only to bring out the essential features of the exchange term.

Moreover, only even powers of a, should be involved in the expansion because the opposite ends of any crystal axis are equivalent. 50) Since a is a unit vector, we have L; a i = 1. Since the addition or subtraction of a constant to U. 51) • Magnetocrystalline anisotropy should be distinguished from an isotropy associated with wave propagation. A magnetized ferrite (with no magnetocrystalline anisotropy) exhibits anisotropic wave propagation; the wave velocity is different for propagation in different directions relative to the biasing field.

Download PDF sample

Rated 4.84 of 5 – based on 32 votes