  Magnetic droplets are non-topological dynamical solitons that can be
nucleated and sustained in nano-contact based spin torque nano-oscillators
(NC-STNOs) with perpendicular anisotropy free layers. While originally
predicted in all-perpendicular NC-STNOs, all experimental demonstrations have
so far relied on orthogonal devices with an in-plane polarizing layer that
requires a strong magnetic field for droplet nucleation. Here, we instead show
the nucleation and sustained operation of magnetic droplets in
all-perpendicular NC-STNOs in modest perpendicular fields and over a wide range
of nano-contact size. The droplet is observed electrically as an intermediate
resistance state accompanied by broadband low-frequency microwave noise. Using
canted fields, which introduce a non-zero relative angle between the free and
fixed layer, the actual droplet precession frequency can also be determined.
Finally, the droplet size, its perimeter width, and its fully reversed core are
directly observed underneath a 80 nm diameter nano-contact using scanning
transmission x-ray microscopy on both the Ni and Co edges. The droplet diameter
is 150 nm, i.e. almost twice the nominal size of the nano-contact, and the
droplet has a perimeter width of about 70 nm.
