TY - JOUR
T1 - Effects of annealing and conformal alumina passivation on anisotropy and hysteresis of magneto-optical properties of cobalt slanted columnar thin films
AU - Briley, Chad
AU - Mock, Alyssa
AU - Korlacki, Rafał
AU - Hofmann, Tino
AU - Schubert, Eva
AU - Schubert, Mathias
N1 - Funding Information:
The authors acknowledge financial support from the National Science Foundation in RII ( EPS-1004094 ) and CAREER ( ECCS-0846329 ) and MRSEC ( DMR-1420645 ), the Swedish Agency for Innovation Systems ( 2014-04712 ), and the University of Nebraska-Lincoln . C. Briley would like to acknowledge Daniel Schmidt for aiding in the development of the VMOGE process and instrumentation at University of Nebraska-Lincoln. DFT calculations were performed using the resources of the Holland Computing Center at the University of Nebraska-Lincoln.
Publisher Copyright:
© 2016
PY - 2017/11/1
Y1 - 2017/11/1
N2 - We present magneto-optical dielectric tensor data of cobalt and cobalt oxide slanted columnar thin films obtained by vector magneto-optical generalized ellipsometry. Room-temperature hysteresis magnetization measurements were performed in longitudinal and polar Kerr geometries on samples prior to and after a heat treatment process with and without a conformal Al 2 O 3 passivation coating. The samples have been characterized by generalized ellipsometry, scanning electron microscopy, and Raman spectroscopy in conjuncture with density functional theory. We observe strongly anisotropic hysteresis behaviors, which depend on the nanocolumn and magnetizing field orientations. We find that deposited cobalt films that have been exposed to heat treatment and subsequent atmospheric oxidation into Co 3 O 4 , when not conformally passivated, reveal no measurable magneto-optical properties while cobalt films with passivation coatings retain highly anisotropic magneto-optical properties.
AB - We present magneto-optical dielectric tensor data of cobalt and cobalt oxide slanted columnar thin films obtained by vector magneto-optical generalized ellipsometry. Room-temperature hysteresis magnetization measurements were performed in longitudinal and polar Kerr geometries on samples prior to and after a heat treatment process with and without a conformal Al 2 O 3 passivation coating. The samples have been characterized by generalized ellipsometry, scanning electron microscopy, and Raman spectroscopy in conjuncture with density functional theory. We observe strongly anisotropic hysteresis behaviors, which depend on the nanocolumn and magnetizing field orientations. We find that deposited cobalt films that have been exposed to heat treatment and subsequent atmospheric oxidation into Co 3 O 4 , when not conformally passivated, reveal no measurable magneto-optical properties while cobalt films with passivation coatings retain highly anisotropic magneto-optical properties.
KW - Anisotropic magnetic hysteresis
KW - Atomic layer deposition
KW - Heat treatment
KW - Slanted columnar thin films
KW - Vector magneto-optical generalized ellipsometry
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U2 - 10.1016/j.apsusc.2016.12.198
DO - 10.1016/j.apsusc.2016.12.198
M3 - Article
AN - SCOPUS:85014101468
VL - 421
SP - 320
EP - 324
JO - Applied Surface Science
JF - Applied Surface Science
SN - 0169-4332
ER -