  An excitation of a large-amplitude out-of-plane magnetization oscillation in
a ferromagnet by the spin Hall effect is of great interest for practical
applications such as microwave generator and neuromorphic computing. However,
both experimental and theoretical works have revealed that only small-amplitude
oscillation around an in-plane easy axis can be excited via the spin Hall
effect. Here, we propose that an out-of-plane oscillation can be excited due to
an assistance of field-like torque. We focus on an in-plane magnetized
ferromagnet with an easy axis parallel to current direction. We notice that the
field-like torque with an appropriate sign provides an additional field
modifying the dynamic trajectory of the magnetization and drives the
auto-oscillation. The condition on the sign of the field-like torque is
satisfied for typical nonmagnet used in spin Hall devices such as tungsten.
