A versatile rotary-stage high frequency probe station for studying   magnetic films and devices
  We present a rotary-stage microwave probe station suitable for magnetic films and spintronic devices. Two stages, one for field rotation from parallel to perpendicular to the sample plane (Out-of-Plane) and the other intended for field rotation within the sample plane (In-Plane) have been designed. The sample, probes and micro positioners are rotated simultaneously with the stages, which allows the field orientation to cover $\theta$ from 0 to $90^{\circ}$ and $\varphi$ from 0 to $360^{\circ}$. $\theta$ and $\varphi$ being the angle between the direction of current flow and field in a Out-of-Plane and an In-Plane rotation, respectively. The operation frequency is up to 40 GHz and the magnetic field up to 1 T. The sample holder, vision system and probe assembly are compactly designed for the probes to land on a wafer with diameter up to 3$\,$cm. Using homemade multi-pin probes and commercially available high frequency probes, several applications including 4-probe DC measurements, the determination of domain wall velocity and spin transfer torque ferromagnetic resonance are demonstrated. 
Shikun He, Zhaoliang Meng, Lisen Huang, Lee Koon Yap, Tiejun Zhou,   Christos Panagopoulos
cond-mat.mtrl-sci