The Physical Principles of Magneto-optical Recording

Abstract

This book covers the physics of magneto-optical recording, beginning with first principles, and working through to contemporary state-of-the-art topics. The first half of the book teaches the theory of diffraction using an original unified approach. It also covers the optics of multilayers, polarization optics, noise in photodetection, and thermal aspects. The second half of the book describes the basics of magnetism and magnetic materials, magneto-static field calculations, domains and domain walls, the mean-field theory, magnetization dynamics, the theory of coercivity, and the process of thermomagnetic recording. Numerous examples based on real-world problems encountered in the engineering design of magneto-optical media and systems will give the reader valuable insights into the science and technology of optical recording. In addition, there are extensive problem sets at the end of each chapter.

Landau-Lifshitz-Bloch equation for ferrimagnetic materials

“…The models for binary ferrimagnetic alloys of the type A x B 1−x , randomly occupied by two different species (A and B) of magnetic ions have been previously extensively investigated theoretically [20][21][22]. In such models A and …”

Arranging matter by magnetic nanoparticle assemblers

“…It should be stressed that the main purpose of the work reported here is to establish the underlying physical principles, investigate the relative importance of various effects, and demonstrate the large degree of control over nonmagnetic colloidal objects that can be achieved through magnetic forces. For this reason, we restrict our attention to systems where all of the magnetic traps are magnetized in the same direction at any given time, even though the possibility of programming individual traps independently from each other does exist and can be accomplished by optically addressable thermomagnetic recording technology (16).…”

Electric field controlled Faraday rotation in an electro-optic/magneto-optic bilayer

“…1,2 For practical reasons it is sometimes necessary to enhance the FR angle by external physical factors. An attractive method to control the FE is by a permanent or alternating electric field applied to a magnetic material.…”