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Transition metal synthetic ferrimagnets: Tunable media for all-optical switching driven by nanoscale spin current

DOI: 10.1021/acs.nanolett.1c03081 DOI Help

Authors: Maciej Dabrowski (University of Exeter) , Jade N. Scott (Queen’s University Belfast) , William R. Hendren (Queen’s University Belfast) , Colin M. Forbes (Queen’s University Belfast) , Andreas Frisk (Diamond Light Source) , David Burn (Diamond Light Source) , David G. Newman (University of Exeter) , Connor R. J. Sait (University of Exeter) , Paul S. Keatley (University of Exeter) , Alpha T. N'Diaye (Advanced Light Source) , Thorsten Hesjedal (University of Oxford) , Gerrit Van Der Laan (Diamond Light Source) , Robert Bowman (Queen’s University Belfast) , Robert J. Hicken (University of Exeter)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nano Letters

State: Published (Approved)
Published: October 2021
Diamond Proposal Number(s): 17745 , 19116 , 20760

Abstract: All-optical switching of magnetization has great potential for use in future ultrafast and energy efficient nanoscale magnetic storage devices. So far, research has been almost exclusively focused on rare-earth based materials, which limits device tunability and scalability. Here, we show that a perpendicularly magnetized synthetic ferrimagnet composed of two distinct transition metal ferromagnetic layers, Ni3Pt and Co, can exhibit helicity independent magnetization switching. Switching occurs between two equivalent remanent states with antiparallel alignment of the Ni3Pt and Co magnetic moments and is observable over a broad temperature range. Time-resolved measurements indicate that the switching is driven by a spin-polarized current passing through the subnanometer Ir interlayer. The magnetic properties of this model system may be tuned continuously via subnanoscale changes in the constituent layer thicknesses as well as growth conditions, allowing the underlying mechanisms to be elucidated and paving the way to a new class of data storage devices.

Journal Keywords: all-optical magnetization switching; synthetic ferrimagnet; spintronics; magnetic recording; ultrafast spin current

Diamond Keywords: Data Storage; Ferrimagnetism; Ferromagnetism; Spintronics

Subject Areas: Materials, Physics, Information and Communication Technology

Instruments: I10-Beamline for Advanced Dichroism

Added On: 28/10/2021 15:07

Discipline Tags:

Quantum Materials Physics Electronics Components & Micro-systems Information & Communication Technologies Magnetism Materials Science Nanoscience/Nanotechnology

Technical Tags:

Spectroscopy Circular Dichroism (CD) X-ray Magnetic Circular Dichroism (XMCD)