TY - JOUR
T1 - The effect of initial growth layer on magnetic properties of Co-Cr films
AU - Kitakami, O.
AU - Ogawa, Y.
AU - Fujiwara, H.
AU - Kugiya, F.
AU - Suzuki, M.
N1 - Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 1988/11
Y1 - 1988/11
N2 - The effect of a Ti underlayer on the magnetic properties of Co-Cr films was investigated. Although the existence of a Ti underlayer does not improve the crystallographic orientation of Co-Cr films, it increases their perpendicular coercive force. In order to clarify the cause of this phenomenon, the film thickness dependence of the magnetic properties of Co-Cr films was investigated. As a result, it was revealed that the coercive force of a Co-Cr fails deposited directly on a polyimide substrate decreases drastically when it becomes thinner than 50nm, whereas in the case of Co-Cr film on a Ti underlayer, a high coercive force is maintained even when it becomes as thin as 20nm. According to our observation of cross-sectional structures, the Co-Cr film with the Ti underlayer has a distinct uniform columnar structure, whereas the Co-Cr film without the Ti underlayer has a 50nm thick initial growth layer which has no clear structure. Moreover, according to the measurements of temperature-dependence of magneticproperties and observations of segregated microstructures in Co-Cr films, it was found that the improvement of magneticproperties by the insertion of the Ti underlayer was mainly due to the improvement of shape anisotropy which was caused by forming a distinctly segregated microstructure.
AB - The effect of a Ti underlayer on the magnetic properties of Co-Cr films was investigated. Although the existence of a Ti underlayer does not improve the crystallographic orientation of Co-Cr films, it increases their perpendicular coercive force. In order to clarify the cause of this phenomenon, the film thickness dependence of the magnetic properties of Co-Cr films was investigated. As a result, it was revealed that the coercive force of a Co-Cr fails deposited directly on a polyimide substrate decreases drastically when it becomes thinner than 50nm, whereas in the case of Co-Cr film on a Ti underlayer, a high coercive force is maintained even when it becomes as thin as 20nm. According to our observation of cross-sectional structures, the Co-Cr film with the Ti underlayer has a distinct uniform columnar structure, whereas the Co-Cr film without the Ti underlayer has a 50nm thick initial growth layer which has no clear structure. Moreover, according to the measurements of temperature-dependence of magneticproperties and observations of segregated microstructures in Co-Cr films, it was found that the improvement of magneticproperties by the insertion of the Ti underlayer was mainly due to the improvement of shape anisotropy which was caused by forming a distinctly segregated microstructure.
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U2 - 10.1109/20.92107
DO - 10.1109/20.92107
M3 - Article
AN - SCOPUS:0024112163
VL - 24
SP - 2353
EP - 2355
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
SN - 0018-9464
IS - 6
ER -