The Scattering of Electric Current on Bubble Domains.

Abstract

The interaction of electric current with different circular domain structures in amorphous TbFe films has been investigated. In homogeneous distribution of electric current density due to the interaction is observed directly using polarizing microscope. In pulsed operation mode the film regions with higher current density can be heated to critical temperature when maze-like structure arises. Electric current densities used in the experiments are 10 6 A/cm

A quantum model for the magnetic multi-valued recording

“…The present work is devoted to proposing a theorectical explanation for the MMV recording which is confirmed by a randomly magnetic thin film [2]. We first propose a model Hamiltonian for such a system in which the magnetic atoms are distributed randomly , then studied its hysteresis loop by the quantum method which is proved to be exact in such case.…”

“…Thus the media for MMV recording must possess several sharp sub-steps in its hysteresis loop. Experimentally, such a phenomenon had been confirmed in some kind of magnetic layered systems [1] - [2]. However, the theoretical origin is not yet very clear.…”

“…However, the recording density has already come to a limit of the conventional scheme so that one must find new approaches. Recently, experimental studies have been made on the magnetic multi-valued (MMV) recording which is believed to be the next strategy of high density recording [1]- [2]. The key point is that there should exist more metastable states which are stable enough to record a message.…”

Theoretical studies of the magnetic multivalued recording in coupled multilayers

“…Many efforts have been devoted to the studies of magnetic multilayers because there have been lots of fascinating behaviors displayed in such systems [1][2][3][4]. One of the important applications of magnetic multilayers in technology is that they can be used as recording media for memory devices.…”

“…The MMV recording requires that more (than two) metastable phases which are stable enough to record messages must exist in the system; therefore, the hysteresis loop for such material should contain more (than one) sharp steps. Experimentally, the MMV recording was firstly confirmed by the field modulation method on disks of bilayers [3] or island on thin layers [4]. However, the theoretical origin is not yet clear.…”