Thermo-magneto-mechanical analysis of head–disk interface in heat assisted magnetic recording

Heat Assisted Magnetic Recording (HAMR) is achieved by heating high-stability magnetic media while applying a magnetic field. Exposure to such a thermal load subjects the head–disk interface to intense thermal strain/stress fields, which can cause transient head–disk contact, failures such as plasti...

Full description

Saved in:
Bibliographic Details
Published in:Tribology international 2005-06, Vol.38 (6), p.588-593
Main Authors: Peng, Wei, Hsia, Yiao-Tee, Sendur, Kursat, McDaniel, Terry
Format: Article
Language:English
Subjects:
Applied sciences
Electronics
Exact sciences and technology
Fracture mechanics (crack, fatigue, damage...)
Friction, wear, lubrication
Fundamental areas of phenomenology (including applications)
HAMR
Heat assisted magnetic recording
Machine components
Magnetic and optical mass memories
Magnetostriction
Mechanical engineering. Machine design
Physics
Solid mechanics
Storage and reproduction of information
Structural and continuum mechanics
Thermal bump
Thermal stress
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Heat Assisted Magnetic Recording (HAMR) is achieved by heating high-stability magnetic media while applying a magnetic field. Exposure to such a thermal load subjects the head–disk interface to intense thermal strain/stress fields, which can cause transient head–disk contact, failures such as plastic deformation, layer–substrate delamination and surface cracking of the head and disk. Furthermore, the stress field alters the preferred direction of magnetization and changes the shape of the magnetization curve below saturation, thereby affecting the magnetic performance such as the permeability in the head. Several 3D boundary/finite element based thermo-magneto-mechanical models are developed to investigate these reliability issues of the HAMR head–disk interface. The temperature elevations and the associated thermal strains and stresses, and their effects on HAMR mechanical and magnetic performances are predicted. Transfer functions are derived, which allow the specification of HAMR material's thermo-mechanical properties to alter the distributions of stresses and distortions, without changing the temperature elevation. An optimal head–disk interface design is predicted based on the simulation results.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2005.01.040