Magnetoelectronics.

An approach to electronics is emerging that is based on the up or down spin of the carriers rather than on electrons or holes as in traditional semiconductor electronics. The physical basis for the observed effects is presented, and the initial successful applications of this technology for information storage are reviewed. Additional opportunities for the exploitation of this technology, which are currently under study, are described.

Hybrid ferromagnetic-semiconductor structure.

Ultrahigh-vacuum growth techniques are now being used to grow single-crystal films of magnetic materials. These growth procedures, carried out in the same molecular beam epitaxy systems commonly used for the growth of semiconductor films, have yielded a variety of new materials and structures that may prove useful for integrated electronics and integrated optical device applications. Examples are given for growth on GaAs and ZnSe, including magnetic sandwiches and patterned structures.

Pulsed gas laser magnetic resonance spectrometer.

A dual-beam pulsed gas laser magnetic resonance spectrometer that incorporates both sample and reference channels has been constructed for magnetooptic studies of solids. This system provides approximately one-hundred far-ir frequencies for spectroscopic use. The various components of the system are described, and particular consideration is given to those techniques that are important for good signal-to-noise ratios.