Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session B20: Frontiers in Growth for Applications I
11:30 AM–2:30 PM,
Monday, March 4, 2024
Room: M101ABC
Sponsoring
Unit:
DCMP
Chair: Bhoj Gautam, Fayetteville State University
Abstract: B20.00005 : Observation of magnetic anisotropy in FeGaB thin films deposited under in-situ applied magnetic field*
12:18 PM–12:30 PM
Presenter:
Serhiy Leontsev
(Air Force Research Laboratory (AFRL))
Authors:
Serhiy Leontsev
(Air Force Research Laboratory (AFRL))
Andrew Franson
(Air Force Research Laboratory (AFRL))
Piyush Shah
(Air Force Research Laboratory (AFRL))
Michael Page
(Air Force Research Laboratory (AFRL))
Michael Newburger
(Air Force Research Laboratory (AFRL))
In present work, we use in-situ magnetic fields during sputter deposition to manipulate the structure and anisotropy of the ferromagnet, FeGaB. An Fe71Ga17B12 target was used to deposit 25nm thickness films via RF and DC sputtering. In-situ bias fields up to 100 mT were applied along various crystal axes during growth, and the role of substrate was explored using YZ-cut LiNbO3, Al2O3 (0001) and Si (100). Regardless of field orientation and substrate, all films showed low FMR linewidth (ΔHFWHM < 34 Oe at 10 GHz) and Gilbert damping (α ~ 4·10-3), as well as surface roughness below 1nm as characterized by AFM. Importantly though, we find that all films exhibit a uniaxial magnetic anisotropy which correlates with the in-situ field direction. XRD further reveals that, despite the expected amorphous nature of FeGaB, ordering can be seen along the field direction.
*This work is partially supported by the Air Force Office of Scientific Research (AFOSR) Award No. FA955023RXCOR00
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