Abstract
The magnetic properties in Pt/Co and Pt/Co/Mx/Pt [1] multilayers
(with Mx= different caping materials), such as perpendicular magnetic
anisotropy (PMA), are of particular interest for spintronic devices. In
particular, it is important to obtain a strong PMA [2] on the
flexible substrate in the field of wearable devices and health
monitoring. However, the impact of different stacks deposition and
modulation conditions on the magnetic properties of the film lacks
systematic research. Here, we investigate the magnetic properties in
Pt/Co/Pt, Pt/Co/RuO2/Pt structures deposited by sputtering with
different hard and flexible substrates, different layer thicknesses,
different deposition temperatures of the buffer layer and different
capping layers. We found that the coercive field and magnetic dynamic
behavior of the films vary with these factors. More-over, depositing the
buffer layer under high temperature can effectively adjust the
crystalline state of the films, thus affecting the performance of the
films. Also, in order to break the symmetry of Pt/Co/Pt we add different
thin film materials between Co and the Pt capping. In addition, we study
the effect of light He+ ions irradiation on the defects and the
magnetics parameters on Pt/Co/Pt. It is expected that ultra-fast
magnetic moment switching can be achieved by optimizing the conditions,
in order to reduce the power consumption of the device. The experimental
results also show that the optimized film conditions can also obtain
strong PMA on the flexible substrate. These findings help to understand
magnetic properties in these structures and show the promising prospect
for wearable devices and other spintronic devices.