Spin-Filter Tunneling

Authored by: Tiffany S. Santos , Jagadeesh S. Moodera

Handbook of Spin Transport and Magnetism

Print publication date:  August  2011
Online publication date:  April  2016

Print ISBN: 9781439803776
eBook ISBN: 9781439803783
Adobe ISBN:

10.1201/b11086-17

 Download Chapter

 

Abstract

Over the last two decades or more, condensed matter physics, and in particular the field of magnetism, is overwhelmingly active in the area of spintronics: the effects of spin-polarized current, its generation, injection, transport, and dynamics. The amount of information generated and the discoveries that have resulted are unprecedented, reshaping not only the direction of magnetism research but also driving technological advances to dizzying heights. Thousands of articles, countless reviews, and several books have been written that cover the field as it is evolving. The field is developing so rapidly and becoming so diverse that it is hard to keep up with. The driving force is the spin-polarized current generated from ferromagnetic elements, compounds, and alloys (metallic or semiconducting) due to their intrinsic exchange energy split conduction band. Generally, the degree of spin polarization (P) is limited to about 50% in conventional ferromagnetic elements and alloys materials. It can reach higher values in a special set of materials called half-metallic ferromagnets [1], which by design are quite difficult to achieve. In this chapter, we deal with another phenomenon called spin-filter tunneling, currently hotly pursued for its capability to provide tunable P all the way to near 100% and can be interfaced with metals or semiconductors, giving the versatility for exploring new effects.

 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.