Magnetic recording device

A magnetic recording device, comprising:

• a magnetic head;
• and
• a controller,
• the magnetic head including:
• a first magnetic pole,
• a second magnetic pole,
• a magnetic element provided between the first magnetic pole and the second magnetic pole,
• a coil,
• a first terminal, and
• a second terminal,
• the first terminal being electrically connected to a part of the magnetic element,
• the second terminal being electrically connected to another part of the magnetic element,
• the magnetic element includes:
• a first magnetic layer,
• a second magnetic layer provided between the first magnetic layer and the second magnetic pole,
• a first non-magnetic layer provided between the first magnetic layer and the second magnetic layer,
• a second non-magnetic layer provided between the second magnetic layer and the second magnetic pole,
• a third non-magnetic layer provided between the first magnetic pole and the first magnetic layer,
• wherein
• when a first coil current of a first frequency is supplied to the coil and a first current is supplied between the first terminal and the second terminal, a first signal having a first signal strength of a first component at the first frequency is generated between the first terminal and the second terminal,
• when the first coil current is supplied to the coil and a second current is supplied between the first terminal and the second terminal, a second signal having a second signal strength of a second component at the first frequency is generated between the first terminal and the second terminal,
• an absolute value of the first coil current is greater than or equal to a coil current value,
• the first current has a first direction from the first magnetic layer to the second magnetic layer,
• the second current has a second direction from the second magnetic layer to the first magnetic layer,
• a second absolute value of the second current is the same as a first absolute value of the first current,
• a change in an absolute value of a difference between a time integration of the first signal strength and a time integration of the second signal strength when the first absolute value is changed includes a first peak and a second peak,
• a first current value of the first absolute value corresponds to the first peak,
• a second current value of the first absolute value corresponds to the second peak,
• the first current value is greater than the second current value,
• the controller is configured to perform a first operation,
• in the first operation, the controller is configured to supply a recording coil current to the coil while supplying a recording element current to the magnetic element,
• an absolute value of the recording coil current is equal to or greater than the coil current value, and
• the recording element current is equal to or less than the first current value.