Actuator materials convert external stimuli into mechanical motion and are utilized in various fields, supporting our daily lives. For example, shape memory alloys can generate high output forces from heat, making them useful in automotive components and robot drives . Electrically driven polymers are expected to be employed artificial muscles and small medical devices due to their material flexibility . Forces in the nN~μN range can be utilized in microelectromechanical systems . Actuator materials play important roles in a wide range of applications, depending on the forces they generate.