US 2023/0245678 A1 · MAGNETIC HEAD AND MAGNETIC RECORDING/REPRODUCING DEVICE

Abstract

According to one embodiment, a magnetic head includes a main pole, an auxiliary magnetic pole provided with a write gap in the main pole, a spin torque control element provided in the write gap, a bias current control portion which supplies a bias current to the spin torque control element, and a resistance measuring portion which measures a resistance value of the spin torque control element. The absolute value of a difference between a first resistance value when a bias current is applied with a polarity that magnetization of the spin torque control element is reversed and a second resistance value when the bias current is applied to a reversed polarity of the polarity is less than or equal to 4%.

Claims16

Dependent claims

A magnetic head comprising:

a main pole;
an auxiliary magnetic pole provided with a write gap in the main pole;
a recording coil wound around a magnetic circuit including the main pole and the auxiliary magnetic pole;
a recording current control portion which supplies a recording current to the recording coil:
a spin torque control element provided in the write gap;
a bias current control portion which supplies a bias current to the spin torque control element;
and
a resistance measuring portion which measures a resistance value of the spin torque control element, wherein
a variability rate of the resistance value of the spin torque control element that is measured a plurality of times after a write operation with respect to a minimum of the measured resistance value is less than or equal to 4%.

6 more elements

Dependencies are inferred from the claim text.

Magnetic head and magnetic recording/reproducing device

Life of this patent

Magnetic head and magnetic recording/reproducing device

Life of this patent

Abstract

Claims16