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Readout of an antiferromagnetic spintronics system by strong exchange coupling of Mn2Au and Permalloy

DOI: 10.1038/s41467-021-26892-7 DOI Help

Authors: S. P. Bommanaboyena (Johannes Gutenberg-Universität) , D. Backes (Diamond Light Source) , L. S. I. Veiga (Diamond Light Source) , S. S. Dhesi (Diamond Light Source) , Y. R. Niu (MAX IV Laboratory) , B. Sarpi (MAX IV Laboratory) , T. Denneulin (Forschungszentrum Jülich) , A. Kovács (Forschungszentrum Jülich) , T. Mashoff (Johannes Gutenberg-Universität) , O. Gomonay (Johannes Gutenberg-Universität) , J. Sinova (Johannes Gutenberg-Universität) , K. Everschor-Sitte (Johannes Gutenberg-Universität) , D. Schönke (Johannes Gutenberg-Universität) , R. M. Reeve (Johannes Gutenberg-Universität) , M. Klaui (Johannes Gutenberg-Universität) , H.-J. Elmers (Johannes Gutenberg-Universität) , M. Jourdan (Johannes Gutenberg-Universität)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Communications , VOL 12

State: Published (Approved)
Published: November 2021
Diamond Proposal Number(s): 29305

Open Access Open Access

Abstract: In antiferromagnetic spintronics, the read-out of the staggered magnetization or Néel vector is the key obstacle to harnessing the ultra-fast dynamics and stability of antiferromagnets for novel devices. Here, we demonstrate strong exchange coupling of Mn2Au, a unique metallic antiferromagnet that exhibits Néel spin-orbit torques, with thin ferromagnetic Permalloy layers. This allows us to benefit from the well-established read-out methods of ferromagnets, while the essential advantages of antiferromagnetic spintronics are only slightly diminished. We show one-to-one imprinting of the antiferromagnetic on the ferromagnetic domain pattern. Conversely, alignment of the Permalloy magnetization reorients the Mn2Au Néel vector, an effect, which can be restricted to large magnetic fields by tuning the ferromagnetic layer thickness. To understand the origin of the strong coupling, we carry out high resolution electron microscopy imaging and we find that our growth yields an interface with a well-defined morphology that leads to the strong exchange coupling.

Journal Keywords: Magnetic devices; Spintronics

Diamond Keywords: Spintronics; Antiferromagnetism; Alloys; Data Storage

Subject Areas: Materials, Physics, Information and Communication Technology

Instruments: I06-Nanoscience

Other Facilities: MAXPEEM at MAX IV

Added On: 15/11/2021 13:43


Discipline Tags:

Quantum Materials Physics Electronics Components & Micro-systems Information & Communication Technologies Magnetism Materials Science Metallurgy

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS)