Spin-Orbit Torque Thermal Sensing for Recording Head Protrusion Control

The patent implements a feedback mechanism by integrating a temperature sensor directly into the recording head that monitors head temperature in real-time. This temperature information is fed back to the TFC system to dynamically adjust heating power, preventing excessive thermal expansion and head protrusion while maintaining precise fly-height control.

The patent replaces traditional mechanical or indirect thermal measurement methods with a direct quantum-based temperature sensing mechanism using spin-orbit torque and anomalous Nernst effect. This substitution enables precise temperature monitoring without adding mechanical complexity that could contribute to head protrusion.

The integrated temperature sensor provides real-time feedback on head temperature during HAMR/MAMR operations. This enables the control system to monitor temperature-induced expansion and adjust operational parameters or activate cooling mechanisms to prevent destructive head/disk interactions while maintaining high storage capacity.

The temperature sensor is self-integrated into the recording head structure, using the head's own thermal field to generate the measurement signal through the anomalous Nernst effect. This self-service approach eliminates the need for external sensing systems and enables autonomous temperature monitoring and control.

The temperature sensor provides real-time feedback on write element temperature during high-speed writing operations. This enables dynamic adjustment of write current pulses to maintain writing speed while preventing excessive thermal accumulation and element protrusion.

The system uses periodic temperature monitoring and pulsed write current application to allow thermal dissipation between writing operations. This periodic action maintains high writing speed while preventing continuous thermal buildup that would cause element expansion.