In-Depth Structural and Magnetic Characterizations of Fe and CrN Bilayer System

Bulletin of the American Physical Society

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APS March Meeting 2021

Volume 66, Number 1

Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA

Session S40: Nanoscale Designed Magnetic Films

11:30 AM–2:30 PM, Thursday, March 18, 2021

Sponsoring Units: GMAG DMP
Chair: Patrick Quarterman, National Institute of Standards and Technology

Abstract: S40.00004 : In-Depth Structural and Magnetic Characterizations of Fe and CrN Bilayer System*

12:30 PM–12:42 PM Live

Abstract

Presenter:

Khan Alam
(Department of Physics, King Fahd University of Petroleum and Minerals)

Authors:

Khan Alam
(Department of Physics, King Fahd University of Petroleum and Minerals)

Arthur Smith
(Department of Physics and Astronomy, Ohio University)

Kai Sun
(Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States)

Andrew Foley
(Department of Physics and Astronomy, Ohio University)

Collaboration:

Khan Alam, Arthur R. Smith, Kai Sun, Andrew Foley,

Iron and chromium nitride bilayer is an ideal system for exchange biasing and sensing applications as the Neel temperature of CrN is 280 K and Curie temperature of Fe 1043 K. For better growth and tunability of the bilayer, it is crucial to understand its crystal and magnetic structures in detail. In this project, we grow high quality epitaxial Fe/CrN bilayer thin films on MgO(001) by molecular beam epitaxy. All bilayers grow in 001 orientation on MgO(001) substrate with uniform layer thicknesses and sharp interfaces. Our data reveals the epitaxial relationship between Fe and CrN crystals and the magnetic structures of Fe and CrN. We found anisotropies of Fe and CrN are parallel to [110]_MgO. We present a model that combines the crystal and magnetic structures of the Fe/CrN bilayer and fully explains all results.

*Research supported by the King Fahd University of Petroleum and Minerals under Award No. SR191024 and and by the U.S. Dept. of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under award No. DE-FG02-06ER46317.

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