Imaging complex domain wall structures in magnetic nanostripes

Apr 19, 2012

(Phys.org) -- Researchers from the NIST Center for Nanoscale Science and Technology and Massachusetts Institute of Technology have used the scanning electron microscopy with polarization analysis (SEMPA) technique to provide the first direct images of the magnetic structure of highly twisted domain walls in patterned thin film magnetic nanowires.

This imaging method allows these complex and delicate structures to be easily compared to magnetic simulations, a useful step for developing technology that uses domain walls in nanowires for high storage and for field or current driven magnetic logic.

A typical domain wall separates two opposite regions of magnetization, making it a “180° wall”. The researchers showed that several 180° walls could be injected into a nanowire, where they either annihilated each other or they combined to form complex walls in which the magnetization rotated by up to 540°. The 360° walls were of particular interest, since their magnetic behavior is dramatically different from the 180° walls currently used in prototype memory and logic devices.

The researchers believe that, in addition to providing information about how 180° walls interact in domain wall-based nanowire memories, this work may lead to new magneto-electronic applications using 360° , such as manipulating bits using highly localized magnetic fields in magnetic logic circuits.

Explore further: New absorber will lead to better biosensors

More information: Formation and structure of 360 and 540 degree domain walls in thin magnetic stripes, Y. Jang, S. R. Bowden, M. Mascaro, J. Unguris, and C. A. Ross, Applied Physics Letters 100, 062407 (2012). apl.aip.org/resource/1/applab/v100/i6/p062407_s1

add to favorites email to friend print save as pdf

Related Stories

Walls falling faster for solid-state memory

Jun 09, 2010

After running a series of complex computer simulations, researchers have found that flaws in the structure of magnetic nanoscale wires play an important role in determining the operating speed of novel devices using such ...

World's tiniest mirror

Aug 10, 2010

Just as the path of photons of light can be directed by a mirror, atoms possessing a magnetic moment can be controlled using a magnetic mirror. Research reported in the Journal of Applied Physics investigates the feasibility of usi ...

Recommended for you

New absorber will lead to better biosensors

22 hours ago

Biological sensors, or biosensors, are like technological canaries in the coalmine. By converting a biological response into an optical or electrical signal, they can alert us to dangers in our external and internal environments. ...

Ultrafast remote switching of light emission

Sep 30, 2014

Researchers from Eindhoven University of Technology can now for the first time remotely control a miniature light source at timescales of 200 trillionth of a second. They published the results on Sept. 2014 ...

Nanotube cathode beats large, pricey laser

Sep 30, 2014

Scientists are a step closer to building an intense electron beam source without a laser. Using the High-Brightness Electron Source Lab at DOE's Fermi National Accelerator Laboratory, a team led by scientist ...

User comments : 0