Abstract:
:Domain walls can be driven by current at very high speeds in nanowires formed from ultra-thin, perpendicularly magnetized cobalt layers and cobalt/nickel multilayers deposited on platinum underlayers due to a chiral spin torque. An important feature of this torque is a magnetic chiral exchange field that each domain wall senses and that can be measured by the applied magnetic field amplitude along the nanowire where the domain walls stop moving irrespective of the magnitude of the current. Here we show that this torque is manifested when the magnetic layer is interfaced with metals that display a large proximity-induced magnetization, including iridium, palladium and platinum but not gold. A correlation between the strength of the chiral spin torque and the proximity-induced magnetic moment is demonstrated by interface engineering using atomically thin dusting layers. High domain velocities are found where there are large proximity-induced magnetizations in the interfaced metal layers.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Ryu KS,Yang SH,Thomas L,Parkin SSdoi
10.1038/ncomms4910subject
Has Abstractpub_date
2014-05-23 00:00:00pages
3910issn
2041-1723pii
ncomms4910journal_volume
5pub_type
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