  Recently the field of cavity magnonics, a field focused on controlling the
interaction between magnons and confined microwave photons within microwave
resonators, has drawn significant attention as it offers a platform for
enabling advancements in quantum- and spin-based technologies. Here, we
introduce excitation vector fields, whose polarisation and profile can be
easily tuned in a two-port cavity setup, thus acting as an effective
experimental knob to explore the coupled dynamics of cavity magnon-polaritons.
Moreover, we develop theoretical models that accurately predict and reproduce
the experimental results for any polarisation state and field profile within
the cavity resonator. This versatile experimental platform offers a new avenue
for controlling spin-photon interactions and as such also delivering a
mechanism to readily control the exchange of information between hybrid
systems.
