160
6 Magnetic Domain Wall Motion
This current-driven domain wall motion has potential to modulate the magnetization configuration of any magnetic nanostructure without applying any external
magnetic field and thereby offering a new technique. Also, with the technological development in nanolithography process, nowadays, fabrication of nanoscale
magnetic wires has become quite easier. This, in turn, inspires dramatic improvement of the performance and functions of recently proposed spintronic devices,
whose operation is based on the motion of a magnetic domain wall (Allwood et al.
2002; Versluijs et al. 2001; Parkin 2004; Numata et al. 2007).
6.5.2 Applications of Current-Driven Domain Wall Motion
Evidently, the position of domain wall in a nanostructured magnetic wire can be
controlled by tuning the intensity, duration and the polarity of the pulsed current.
Thus, the phenomenon of current-driven domain wall motion is potential for spintronic device applications such as novel memory and storage devices (Allwood et al.
2002; Versluijs et al. 2001; Parkin 2004; Numata et al. 2007). In this context, some
critical conditions that need to be satisfied for implementation in practical device
applications should be mentioned:
1. Low threshold current density;
2. High domain wall velocity;
3. Stability and controllability of domain wall position.
These three conditions should be satisfied simultaneously for the operations of
real devices.
6.6 Conclusions
In this chapter, we have presented an introduction on magnetic domain walls motion
in magnetic materials. We have discussed several factors, like the origin of magnetic
domain wall, domain wall width, the reason for small particles to be mono-domain,
etc. Furthermore, we have addressed the relevance of magnetic domain walls motion
in spintronics. In this direction, we have first focussed our discussion on the detection of domain-wall propagation. Moreover, we have also reviewed ratchet effect in
magnetic domain wall motion and its applicability in the field of spintronics. Other
important issue that has been addressed is the measurements of domain wall motion
velocity. Furthermore, in the context of spintronics application, we have discussed
current-driven domain wall motion.
6 Magnetic Domain Wall Motion
This current-driven domain wall motion has potential to modulate the magnetization configuration of any magnetic nanostructure without applying any external
magnetic field and thereby offering a new technique. Also, with the technological development in nanolithography process, nowadays, fabrication of nanoscale
magnetic wires has become quite easier. This, in turn, inspires dramatic improvement of the performance and functions of recently proposed spintronic devices,
whose operation is based on the motion of a magnetic domain wall (Allwood et al.
2002; Versluijs et al. 2001; Parkin 2004; Numata et al. 2007).
6.5.2 Applications of Current-Driven Domain Wall Motion
Evidently, the position of domain wall in a nanostructured magnetic wire can be
controlled by tuning the intensity, duration and the polarity of the pulsed current.
Thus, the phenomenon of current-driven domain wall motion is potential for spintronic device applications such as novel memory and storage devices (Allwood et al.
2002; Versluijs et al. 2001; Parkin 2004; Numata et al. 2007). In this context, some
critical conditions that need to be satisfied for implementation in practical device
applications should be mentioned:
1. Low threshold current density;
2. High domain wall velocity;
3. Stability and controllability of domain wall position.
These three conditions should be satisfied simultaneously for the operations of
real devices.
6.6 Conclusions
In this chapter, we have presented an introduction on magnetic domain walls motion
in magnetic materials. We have discussed several factors, like the origin of magnetic
domain wall, domain wall width, the reason for small particles to be mono-domain,
etc. Furthermore, we have addressed the relevance of magnetic domain walls motion
in spintronics. In this direction, we have first focussed our discussion on the detection of domain-wall propagation. Moreover, we have also reviewed ratchet effect in
magnetic domain wall motion and its applicability in the field of spintronics. Other
important issue that has been addressed is the measurements of domain wall motion
velocity. Furthermore, in the context of spintronics application, we have discussed
current-driven domain wall motion.