Observation of Skyrmions at Room Temperature in Co
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Posted On: 03/31/2017 11:21:48 AM
Observation of Skyrmions at Room Temperature in Co2FeAl Heusler Alloy Ultrathin Films
Sajid Husain, Naveen Sisodia, Avinash Kumar Chaurasiya, Ankit Kumar, Serkan Akanse, Anjan Barman, P. K. Mudulli, Peter Svedlindh, Sujeet Chaudhary
(Submitted on 29 Mar 2017)
Magnetic skyrmions are topological spin structures having immense potential for energy efficient spintronic devices. However, observations of skyrmions at room temperature are limited to patterned nanostructures. Here, we report the observation of stable skyrmions in unpatterned Ta/Co2FeAl(CFA)/MgO thin film heterostructures at room temperature and in zero external magnetic field employing magnetic force microscopy. The skyrmions are observed in a trilayer structure comprised of heavy metal (HM)/ferromagnet (FM)/Oxide interfaces which result in strong interfacial Dzyaloshinskii-Moriya interaction (i-DMI) as evidenced by Brillouin light scattering measurements, in agreement with the results of micromagnetic simulations. We also emphasize on room temperature observation of multiple skyrmions which can be stabilized for suitable choices of CFA layer thickness, perpendicular magnetic anisotropy, and i-DMI. These results open up a new paradigm for designing room temperature spintronic devices based on skyrmions in FM continuous thin films.
https://arxiv.org/abs/1703.10224
Sajid Husain, Naveen Sisodia, Avinash Kumar Chaurasiya, Ankit Kumar, Serkan Akanse, Anjan Barman, P. K. Mudulli, Peter Svedlindh, Sujeet Chaudhary
(Submitted on 29 Mar 2017)
Magnetic skyrmions are topological spin structures having immense potential for energy efficient spintronic devices. However, observations of skyrmions at room temperature are limited to patterned nanostructures. Here, we report the observation of stable skyrmions in unpatterned Ta/Co2FeAl(CFA)/MgO thin film heterostructures at room temperature and in zero external magnetic field employing magnetic force microscopy. The skyrmions are observed in a trilayer structure comprised of heavy metal (HM)/ferromagnet (FM)/Oxide interfaces which result in strong interfacial Dzyaloshinskii-Moriya interaction (i-DMI) as evidenced by Brillouin light scattering measurements, in agreement with the results of micromagnetic simulations. We also emphasize on room temperature observation of multiple skyrmions which can be stabilized for suitable choices of CFA layer thickness, perpendicular magnetic anisotropy, and i-DMI. These results open up a new paradigm for designing room temperature spintronic devices based on skyrmions in FM continuous thin films.
https://arxiv.org/abs/1703.10224
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