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Multidomain memristive switching of Pt38Mn62/[Co/Ni]n multilayers

DOI: 10.1103/PhysRevApplied.14.044036 DOI Help

Authors: G. Krishnaswamy (ETH Zurich) , A. Kurenkov (Tohoku University) , G. Sala (ETH Zurich) , M. Baumgartner (ETH Zurich) , V. Krizakova (ETH Zurich) , C. Nistor (ETH Zurich) , F. Maccherozzi (Diamond Light Source) , S. S. Dhesi (Diamond Light Source) , S. Fukami (Tohoku University) , H. Ohno (Tohoku University) , P. Gambardella (ETH Zurich)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Applied , VOL 14

State: Published (Approved)
Published: October 2020
Diamond Proposal Number(s): 20413 , 17512

Abstract: We investigate the mechanism of analoglike switching of Pt 38 Mn 62 /[ Co / Ni ] multilayers induced by spin-orbit torques. X-ray photoemission microscopy performed during magnetization reversal driven by current pulses shows that sequential switching of reproducible domain patterns can be achieved. Switching proceeds by domain-wall displacement starting from the edges of blocked ferromagnetic domains, which do not switch for either direction of the current and represent up to 24% of the total ferromagnetic area. The antiferromagnetic Pt 38 Mn 62 layer has a granular texture, with the majority of the domains being smaller than 100 nm, whereas the ferromagnetic domains in Co / Ni are typically larger than 200 nm. The blocked domains and the granular distribution of exchange bias constrain the origin as well as the displacement of the domain walls, thus leading to highly reproducible switching patterns as a function of the applied current pulses. These measurements clarify the origin of the memristive behavior in antiferromagnet-ferromagnet structures and provide clues for further optimization of spin-orbit torque switching and memristivity in these systems.

Journal Keywords: Exchange bias Magnetic domains; Magnetization switching; Spin torque; Antiferromagnets; Magnetic multilayers; Transition-metal alloys; Photoelectron emission microscopy

Diamond Keywords: Spintronics; Ferromagnetism; Antiferromagnetism

Subject Areas: Materials, Physics


Instruments: I06-Nanoscience

Added On: 17/08/2021 13:58

Discipline Tags:

Materials Science Quantum Materials Physics Electronics Hard condensed matter - structures Magnetism

Technical Tags:

Microscopy Electron Microscopy (EM) PhotoEmmission Electron Microscopy (PEEM)