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I06-Nanoscience (XPEEM)	Synthetic ferrimagnet nanowires with very low critical current density for coupled domain wall motion Serban Lepadatu , Henri Saarikoski , Robert Beacham , Maria Jose Benitez , Thomas A. Moore , Gavin Burnell , Satoshi Sugimoto , Daniel Yesudas , May C. Wheeler , Jorge Miguel , Sarnjeet S. Dhesi , Damien Mcgrouther , Stephen Mcvitie , Gen Tatara , Christopher Marrows Scientific Reports 7 DOI: 10.1038/s41598-017-01748-7 Diamond Proposal Number(s): [6709] Open Access Show Abstract ▼ Abstract: Domain walls in ferromagnetic nanowires are potential building-blocks of future technologies such as racetrack memories, in which data encoded in the domain walls are transported using spin-polarised currents. However, the development of energy-efficient devices has been hampered by the high current densities needed to initiate domain wall motion. We show here that a remarkable reduction in the critical current density can be achieved for in-plane magnetised coupled domain walls in CoFe/Ru/CoFe synthetic ferrimagnet tracks. The antiferromagnetic exchange coupling between the layers leads to simple Néel wall structures, imaged using photoemission electron and Lorentz transmission electron microscopy, with a width of only ~100 nm. The measured critical current density to set these walls in motion, detected using magnetotransport measurements, is 1.0 × 1011 Am−2, almost an order of magnitude lower than in a ferromagnetically coupled control sample. Theoretical modelling indicates that this is due to nonadiabatic driving of anisotropically coupled walls, a mechanism that can be used to design efficient domain-wall devices.	May 2017

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I06-Nanoscience (XPEEM)

Synthetic ferrimagnet nanowires with very low critical current density for coupled domain wall motion