Accession Number:

AD1183944

Title:

W91NF1310107 Progress Report for 10/01/2013 ~ 9/30/2014

Descriptive Note:

[Technical Report, Technical Report]

Corporate Author:

IBM RESEARCH DIV SAN JOSE CA

Personal Author(s):

Report Date:

2014-10-01

Pagination or Media Count:

9

Abstract:

Previously we reported a novel mechanism to move domain walls with nanosecond long current pulses in perpendicularly magnetized thin films that are formed from multilayers composed of atomically thin cobalt and nickel layers, that are formed on heavy metal underlayers such as platinumor iridium or palladium andor have heavy metal overlayers. This mechanism, which we entitled achiral spin torque CST, arises from spin-orbit interactions in perpendicularly magnetized, ultrathin films that display chiral domain walls DWs. The chirality of the domain walls is set by an exchange interaction of magnetic layers that display perpendicular magnetic anisotropy PMA at the interface with the heavy metal layer. The chiral spin torque CST is distinct from conventional spin transfer torque STT and provides a very efficient mechanism to manipulate DWs motion in nanowires for Racetrack Memory, the focus of our program 1,2.

Descriptors:

• spin-orbit interaction
• domain walls
• quantum properties
• magnetic fields
• metals
• heavy metals
• anisotropy
• couplings
• current density
• dynamics
• magnetic domains
• magnetization
• nanowires
• standards
• thickness
• triangles
• abstracts

Subject Categories:

• Electricity and Magnetism

Distribution Statement:

[A, Approved For Public Release]