Voltage Assisted Perpendicular Write Head

Abstract

A novel perpendicular write head design is proposed. In this design, an active stress is applied in synchronization with the write current waveform by applying voltage across electrostrictive material adjacent to the head yoke and pole tip. With sufficient stress magnitude, a planar magnetic anisotropy can be induced perpendicular to the head air-bearing surface via the natural magnetostrictive effect in high moment magnetic materials. The dynamically induced magnetic anisotropy, synchronized to the write current transition, can significantly enhance the write efficiency and, more importantly, improve cross-track write field gradient and ensure zero head remanence.Index Terms-Electrostrictive materials, magnetostriction, perpendicular write head, single-pole write head.

High-density perpendicular recording—advances, issues, and extensibility

“…To control side charge, Zhu and Bai [10] proposed to use stress to modulate the anisotropy of the write pole. Thus during writing, there would be a strong uniaxial anisotropy, reducing the side charge, while during reading, anisotropy would be lowered to control remanance.…”