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A Split-Pole-Gapped NFT Write Head Design for Transition Curvature Reduction in Heat-Assisted Magnetic Recording

机译:裂隙间隙NFT写头设计,用于减少热辅助磁记录中的过渡曲率

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摘要

A write head design consisting of a split pole and a gapped near-field transducer is presented. Through simulation, we found our design can produce a maximum effective cross-track recording field gradient of 300 Oem, and a maximum difference of 3.6 kOe between the center and ±20 nm away in the cross-track direction in the recording media near the magnetic gap (MG). The tradeoff between improved cross-track magnetic gradient and loss of optical efficiency due to parasitic absorption by the pole is studied as a function of the thickness of a low optical-index separator between the MG and the optical gap (OG). The separator is tapered to bring the cross-track field gradient close to the OG near the air bearing surface, while limiting the total amount of interaction of the evanescent optical field with the pole. With this tapered low-index separator, we are able to preserve the recording field cross-track gradient and amplitude, while reducing the parasitic optical absorption in the recording head due to pole proximity.
机译:提出了一种由分裂极和带间隙的近场换能器组成的写头设计。通过仿真,我们发现我们的设计可以产生最大有效跨轨记录场梯度为300 Oe / nm,并且在附近的记录介质中,沿跨轨方向中心和±20 nm处的最大中心差为3.6 kOe。磁隙(MG)。研究了改进的跨轨磁梯度和由于磁极的寄生吸收导致的光学效率损失之间的权衡,该损失是MG与光学间隙(OG)之间的低光学指数隔板厚度的函数。分离器是锥形的,以使跨轨道场梯度接近空气轴承表面附近的OG,同时限制了e逝光场与极的相互作用的总量。使用这种锥形低折射率分离器,我们能够保留记录场的跨轨梯度和幅度,同时减少由于磁极接近而导致的记录头中的寄生光吸收。

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