According to one embodiment, a magnetic recording device includes a magnetic head and a magnetic recording medium. The magnetic head includes a first magnetic pole, a second magnetic pole, and a magnetic element provided between the first magnetic pole and the second magnetic pole. The magnetic element includes a first magnetic layer, and a second magnetic layer provided between the first magnetic layer and the second magnetic pole. The magnetic element includes a midpoint between the first magnetic layer and the second magnetic layer in a first direction from the first magnetic pole to the second magnetic pole.

A data storage medium includes a cobalt-based ferromagnetic recording layer, a non-magnetic substrate, and a magnetocaloric material. The magnetocaloric material is disposed between the recording layer and the substrate, wherein the magnetocaloric material is configured to generate heat upon exposure to a magnetic field that causes a phase change in the magnetocaloric material. A method of writing data onto a data storage medium includes applying a magnetic field to the data storage medium at a write location from a write head, wherein the data storage medium includes a cobalt-based ferromagnetic recording layer, a non-magnetic substrate, and a magnetocaloric material disposed between the recording layer and the substrate. The method includes transferring heat from the magnetocaloric material to the recording layer; moving the write location out of the magnetic field, wherein the phase change is reversed; and absorbing heat from the recording layer by the magnetocaloric material.

According to one embodiment, a magnetic recording device includes 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. 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. The recording element current is equal to or less than the first current value.

According to one embodiment, a magnetic recording device includes 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 controller is configured to switch between a first operation and a second operation. In the first operation, the controller is configured to supply a first recording coil current to the coil while supplying a first recording element current to the magnetic element. In the second operation, the controller is configured to supply a second recording coil current to the coil while supplying a second recording element current to the magnetic element.

According to one embodiment, a magnetic recording device includes a magnetic head and a controller. The magnetic head includes a first magnetic pole, a second magnetic pole, a magnetic element provided between the first magnetic pole and the second magnetic pole, a first terminal, a second terminal, and a coil. 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 less than the first coil current value.