Correlative magnetic imaging of heat-assisted magnetic recording media in cross section using lorentz TEM and MFM

Taeho Roy Kim; Charudatta Phatak; Amanda K. Petford-Long; Yunzhi Liu; Chad Taylor; Bing Zhang; Sharon Myers; Andrea Greene; Tomoko Seki; Michael Alex; Gerardo A. Bertero; Robert Sinclair

doi:10.1109/TMAG.2017.2753170

Correlative magnetic imaging of heat-assisted magnetic recording media in cross section using lorentz TEM and MFM

Taeho Roy Kim, Charudatta Phatak, Amanda K. Petford-Long, Yunzhi Liu, Chad Taylor, Bing Zhang, Sharon Myers, Andrea Greene, Tomoko Seki, Michael Alex, Gerardo A. Bertero, Robert Sinclair^*

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

In order to increase the storage density of hard disk drives, a detailed understanding of the magnetic structure of the granular magnetic layer is essential. Here, we demonstrate an experimental procedure of imaging recorded bits on heat-assisted magnetic recording (HAMR) media in cross section using Lorentz transmission electron microscopy (TEM). With magnetic force microscopy and focused ion beam (FIB), we successfully targeted a single track to prepare cross-sectional TEM specimens. Then, we characterized the magnetic structure of bits with their precise location and orientation using Fresnel mode of Lorentz TEM. This method can promote understanding of the correlation between bits and their material structure in HAMR media to design better the magnetic layer.

Original language	English (US)
Article number	A2056
Journal	IEEE Transactions on Magnetics
Volume	54
Issue number	1
DOIs	https://doi.org/10.1109/TMAG.2017.2753170
State	Published - Jan 2018

Keywords

Cross-sectional magnetic imaging
Fresnel imaging mode
Heat-assisted magnetic recording (HAMR) media
Lorentz transmission electron microscopy (TEM)
Recorded bits

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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Kim, Taeho Roy ; Phatak, Charudatta ; Petford-Long, Amanda K. ; Liu, Yunzhi ; Taylor, Chad ; Zhang, Bing ; Myers, Sharon ; Greene, Andrea ; Seki, Tomoko ; Alex, Michael ; Bertero, Gerardo A. ; Sinclair, Robert. / Correlative magnetic imaging of heat-assisted magnetic recording media in cross section using lorentz TEM and MFM. In: IEEE Transactions on Magnetics. 2018 ; Vol. 54, No. 1.

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title = "Correlative magnetic imaging of heat-assisted magnetic recording media in cross section using lorentz TEM and MFM",

abstract = "In order to increase the storage density of hard disk drives, a detailed understanding of the magnetic structure of the granular magnetic layer is essential. Here, we demonstrate an experimental procedure of imaging recorded bits on heat-assisted magnetic recording (HAMR) media in cross section using Lorentz transmission electron microscopy (TEM). With magnetic force microscopy and focused ion beam (FIB), we successfully targeted a single track to prepare cross-sectional TEM specimens. Then, we characterized the magnetic structure of bits with their precise location and orientation using Fresnel mode of Lorentz TEM. This method can promote understanding of the correlation between bits and their material structure in HAMR media to design better the magnetic layer.",

keywords = "Cross-sectional magnetic imaging, Fresnel imaging mode, Heat-assisted magnetic recording (HAMR) media, Lorentz transmission electron microscopy (TEM), Recorded bits",

author = "Kim, {Taeho Roy} and Charudatta Phatak and Petford-Long, {Amanda K.} and Yunzhi Liu and Chad Taylor and Bing Zhang and Sharon Myers and Andrea Greene and Tomoko Seki and Michael Alex and Bertero, {Gerardo A.} and Robert Sinclair",

note = "Funding Information: ACKNOWLEDGMENT T. R. Kim and R. Sinclair would like to thank Western Digital for partial financial support. Part of this work was performed at the Stanford Nano Shared Facilities (SNSF). The work of C. Phatak and A. K. Petford-Long was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division.",

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language = "English (US)",

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journal = "IEEE Transactions on Magnetics",

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Correlative magnetic imaging of heat-assisted magnetic recording media in cross section using lorentz TEM and MFM. / Kim, Taeho Roy; Phatak, Charudatta; Petford-Long, Amanda K.; Liu, Yunzhi; Taylor, Chad; Zhang, Bing; Myers, Sharon; Greene, Andrea; Seki, Tomoko; Alex, Michael; Bertero, Gerardo A.; Sinclair, Robert.

In: IEEE Transactions on Magnetics, Vol. 54, No. 1, A2056, 01.2018.

Research output: Contribution to journal › Article › peer-review

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AU - Phatak, Charudatta

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AU - Taylor, Chad

AU - Zhang, Bing

AU - Myers, Sharon

AU - Greene, Andrea

AU - Seki, Tomoko

AU - Alex, Michael

AU - Bertero, Gerardo A.

AU - Sinclair, Robert

N1 - Funding Information: ACKNOWLEDGMENT T. R. Kim and R. Sinclair would like to thank Western Digital for partial financial support. Part of this work was performed at the Stanford Nano Shared Facilities (SNSF). The work of C. Phatak and A. K. Petford-Long was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division.

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AB - In order to increase the storage density of hard disk drives, a detailed understanding of the magnetic structure of the granular magnetic layer is essential. Here, we demonstrate an experimental procedure of imaging recorded bits on heat-assisted magnetic recording (HAMR) media in cross section using Lorentz transmission electron microscopy (TEM). With magnetic force microscopy and focused ion beam (FIB), we successfully targeted a single track to prepare cross-sectional TEM specimens. Then, we characterized the magnetic structure of bits with their precise location and orientation using Fresnel mode of Lorentz TEM. This method can promote understanding of the correlation between bits and their material structure in HAMR media to design better the magnetic layer.

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