Using spin SEM in this way to observe the
magnetic domains on the Co (0001) surface at various temperatures helps in investigating the magnetic properties associated with reported phase transitions.
Concepts for information storage and logical processing based on
magnetic domain walls have great potential for implementation in future information and communications technologies."
The
magnetic domain size was calculated for the [Fe.sub.3][O.sub.4] nanoparticles to be 9 nm as shown in Figure 10(b).
The
magnetic domain will rotate when the external magnetic field H is applied.
The motion of
magnetic domains can be divided into reversible or irreversible movement and rotation.
(2009) Dynamics of
magnetic domain walls in nanomagnetic systems.
The paper is titled 'Dynamics of
magnetic domain walls under their own inertia' and is authored by Luc Thomas, Rai Moriya, Charles Rettner and Stuart Parkin of IBM Research - Almaden.
The coercivity of crystalline alloys depends strongly of their size because the
magnetic domain walls interact with the grain boundaries.
As reported in their article in Science last June (www.sciencemag.org/cgi/content/full/296/5575/2003), the team used OOMMF to determine the appropriate device widths for containing and controlling the
magnetic domain walls.
A fixed magnetic field is also applied in this direction by hard bias films to establish a single
magnetic domain in the sensing layer.
FAST Technology, Livonia, MI, has introduced a line of sensors using Embedded
Magnetic Domain technology, which combines magnetic induction and electronic processing for direct torque measurement.
FAST's Embedded
Magnetic Domain systems can measure torque in a static or rotating shaft at speeds upwards of 100,000 rpm.