Magnetic recording device and magnetic head

A magnetic recording device, comprising:

• a magnetic head including a magnetic pole, a first shield, a stacked body provided between the magnetic pole and the first shield, a first terminal electrically connected to the magnetic pole, a second terminal electrically connected to the first shield, and a coil;
• a first circuit electrically connected to the first terminal and the second terminal;
• and
• a second circuit electrically connected to the coil,
• the first circuit configured to switch between a first operation and a second operation,
• in the first operation, the first circuit being configured to supply a first current to a current path between the first terminal and the second terminal when the second circuit supplies a recording current to the coil, the first current being smaller than a second current, the second current causing an oscillation of an electrical resistance of the current path, the first current not causing an oscillation of the electrical resistance of the current path,
• in the second operation, the first circuit being configured to supply the second current to the current path when the second circuit supplies the recording current to the coil.