Fabrication of Magnetic Micro-Machine with Heating Device

A magnetic micro-machine with a heating device, which can run in gel, was fabricated. The machine is composed of a screw tip, a rod-shaped NdFeB magnet, and a rod-shaped permalloy unit. The machine is 2 mm in diameter and 19 mm in length. The NdFeB magnet is magnetized to the direction of the diameter. When a rotational magnetic field with rotation frequency of 10 Hz is applied, the machine rotates and moves in agar. In addition, a machine placed in an alternating magnetic field, at 100kHz, produces heat by iron loss. It was demonstrated that the machine can move 20 mm and be heated above 50°C. This means a wireless heating mechanism could be obtained using an alternating magnetic field and a rotational magnetic field. This machine has the great possibilities for local medical operations for cancer.