US 10,381,029 B2 · Method and system for providing a HAMR writer including a multi-mode interference device

Abstract

A heat-assisted magnetic recording (HAMR) write apparatus includes a laser for providing energy and resides in proximity to a media during use. The HAMR write apparatus includes a write pole that writes to a region of the media, coil(s) for energizing the write pole and a waveguide optically coupled with the laser. The waveguide includes at least one multi-mode interference (MMI) device. The MMI device has at least one input, a plurality of outputs, a propagation section and a multi-mode interference (MMI) section. Energy from the laser propagates through the propagation section before the MMI section. The propagation section expands the energy from the laser to a plurality of modes. A first portion of the outputs is output from the propagation section. The MMI section is between the propagation section and a second portion of the plurality of outputs.

Claims20

Dependent claims

A magnetic write apparatus comprising:

a waveguide configured to direct energy from a light source to a near field transducer, the waveguide comprising a multi-mode interference device comprising a propagation section,
wherein the propagation section receives the energy from the light source via a propagation section entrance;
and
wherein the propagation section entrance is narrower than a propagation section exit.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

15/923,044Filed 16 Mar 2018 · continuation

Priority

10 Nov 2015

Published

US 2018/0204590 A119 Jul 2018

Granted

13 Aug 2019

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

G11B 5/127
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor: structure or…
G11B 5/105
Structure or manufacture of housings or shields for heads: mounting of head within housing or assembling of head and housing
G11B 5/314
Including layers not usually being a part of the electromagnetic transducer structure and providing additional features, e.g. for improving heat…:…
G11B 5/6088
Specially adapted for spacing from a rotating disc using a fluid cushion: optical waveguide in or on flying head

Method and system for providing a HAMR writer including a multi-mode interference device

Life of this patent

Method and system for providing a HAMR writer including a multi-mode interference device

Life of this patent

Abstract

Claims20