Nanoscale Dynamics in Magnetism

Authored by: Yves Acremann , Siegmann Hans Christoph

1 Handbook of Nanophysics

Print publication date:  September  2010
Online publication date:  September  2010

Print ISBN: 9781420075403
eBook ISBN: 9781420075410
Adobe ISBN:

10.1201/9781420075410-33

 Download Chapter

 

Abstract

In the past decades, we have learned how nanometric fabrication techniques lead to nanometer-scale magnets. It is now well established that nanomagnets can possess quite different static magnetic properties compared to their parent bulk material [1]. More recently, it has been found that magnetization dynamics is generally also quite different from what is expected from bulk studies, in particular the switching of the magnetization to the opposite direction, one of the basic operations in the application of magnetism which follows a pathway that is unique and differs quite dramatically depending on size, shape, and interface of the magnetic structure with its substrate [2]. Nanomagnets are of high current interest as they have many applications, e.g., in data storage technology, magnetic field sensing, and development of hard magnets [3]. Magnetization dynamics is known to involve a large range of time scales extending from millions of years in geomagnetism to years in magnetic storage media, milli- and microseconds in AC transformers, and nanoseconds in magnetic data writing and reading. This survey covers ultrafast magnetization dynamics ranging from nanosecond (10–9 s) over picosecond (10–12 s) to femtosecond (10–15 s) in nano-sized particles and magnetic structures. New tools such as pulsed lasers, x-ray sources, and polarized electron currents have extended the study of magnetism dynamics to the femtosecond time-range at nanoscale spatial resolution. Specifically, the new pulsed x-ray sources such as synchrotron-based sources and x-ray lasers combine the possibility to observe the dynamics of magnetic processes in nanoscale structures with element specificity.

 Cite
Search for more...
Back to top

Use of cookies on this website

We are using cookies to provide statistics that help us give you the best experience of our site. You can find out more in our Privacy Policy. By continuing to use the site you are agreeing to our use of cookies.