High Density Heat-Assisted Magnetic Recording Media and Advanced Characterization - Progress and Challenges

Ganping Ju; Yingguo Peng; Eric K C Chang; Yinfeng Ding; Alexander Q. Wu; Xiaobin Zhu; Yukiko Kubota; Timothy J. Klemmer; Hassib Amini; Li Gao; Zhaohui Fan; Tim Rausch; Pradeep Subedi; Minjie Ma; Sangita Kalarickal; Chris J. Rea; Dimitar V. Dimitrov; Pin Wei Huang; Kangkang Wang; Xi Chen; Chubing Peng; Weibin Chen; John W. Dykes; Mike A. Seigler; Edward C. Gage; Roy Chantrell; Jan Ulrich Thiele

doi:10.1109/TMAG.2015.2439690

High Density Heat-Assisted Magnetic Recording Media and Advanced Characterization - Progress and Challenges

Ganping Ju^*, Yingguo Peng, Eric K C Chang, Yinfeng Ding, Alexander Q. Wu, Xiaobin Zhu, Yukiko Kubota, Timothy J. Klemmer, Hassib Amini, Li Gao, Zhaohui Fan, Tim Rausch, Pradeep Subedi, Minjie Ma, Sangita Kalarickal, Chris J. Rea, Dimitar V. Dimitrov, Pin Wei Huang, Kangkang Wang, Xi ChenChubing Peng, Weibin Chen, John W. Dykes, Mike A. Seigler, Edward C. Gage, Roy Chantrell, Jan Ulrich Thiele

^*Corresponding author for this work

Physics

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

Abstract

Heat-assisted magnetic recording (HAMR) is being developed as the next generation magnetic recording technology. Critical components of this technology, such as plasmonic near-field transducer (NFT) and high anisotropy granular FePt media, as well as the performance and reliability of fully integrated drives have been reported. This paper will focus on the progress and challenges of HAMR media, including microstructure and thermal design as well as the testing and characterization at high field and high temperature. Due to the importance of the Curie temperature distribution, \sigma T{C} , for HAMR, we present a newly developed temperature-dependent complex ac susceptibility method to extract \sigma T{C} for HAMR media. Such novel magnetic characterization methods have been used in combination with other high field magnetic metrology and spin-stand recording to provide feedback for continuous improvements of HAMR media. Together with NFT and write head design, the thermal design, \sigma T{C} , and microstructure of the media are key factors to reduce the transition jitter below 2 nm as demonstrated in a previously reported 1 Tb/in² HAMR demonstration. Here, we report the further improvements by significantly enabling higher linear density (>2500 kfci) HAMR and steady progress in areal density to 1.402 Tb/in².

Original language	English
Article number	7115916
Pages (from-to)	1-9
Number of pages	9
Journal	IEEE Transactions on Magnetics
Volume	51
Issue number	11
DOIs	https://doi.org/10.1109/TMAG.2015.2439690
Publication status	Published - 1 Nov 2015

Keywords

BTD demo
FePtX media
HAMR (Heat assisted magnetic recording)
media microstructure
NFT (Near field transducer)
TC distributions
thermal design

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10.1109/TMAG.2015.2439690

Cite this

Ju, G., Peng, Y., Chang, E. K. C., Ding, Y., Wu, A. Q., Zhu, X., Kubota, Y., Klemmer, T. J., Amini, H., Gao, L., Fan, Z., Rausch, T., Subedi, P., Ma, M., Kalarickal, S., Rea, C. J., Dimitrov, D. V., Huang, P. W., Wang, K., ... Thiele, J. U. (2015). High Density Heat-Assisted Magnetic Recording Media and Advanced Characterization - Progress and Challenges. IEEE Transactions on Magnetics, 51(11), 1-9. Article 7115916. https://doi.org/10.1109/TMAG.2015.2439690

@article{8101682ba272468381f4e6d08a76e3ed,

title = "High Density Heat-Assisted Magnetic Recording Media and Advanced Characterization - Progress and Challenges",

abstract = "Heat-assisted magnetic recording (HAMR) is being developed as the next generation magnetic recording technology. Critical components of this technology, such as plasmonic near-field transducer (NFT) and high anisotropy granular FePt media, as well as the performance and reliability of fully integrated drives have been reported. This paper will focus on the progress and challenges of HAMR media, including microstructure and thermal design as well as the testing and characterization at high field and high temperature. Due to the importance of the Curie temperature distribution, \sigma T{C} , for HAMR, we present a newly developed temperature-dependent complex ac susceptibility method to extract \sigma T{C} for HAMR media. Such novel magnetic characterization methods have been used in combination with other high field magnetic metrology and spin-stand recording to provide feedback for continuous improvements of HAMR media. Together with NFT and write head design, the thermal design, \sigma T{C} , and microstructure of the media are key factors to reduce the transition jitter below 2 nm as demonstrated in a previously reported 1 Tb/in2 HAMR demonstration. Here, we report the further improvements by significantly enabling higher linear density (>2500 kfci) HAMR and steady progress in areal density to 1.402 Tb/in2.",

keywords = "BTD demo, FePtX media, HAMR (Heat assisted magnetic recording), media microstructure, NFT (Near field transducer), TC distributions, thermal design",

author = "Ganping Ju and Yingguo Peng and Chang, {Eric K C} and Yinfeng Ding and Wu, {Alexander Q.} and Xiaobin Zhu and Yukiko Kubota and Klemmer, {Timothy J.} and Hassib Amini and Li Gao and Zhaohui Fan and Tim Rausch and Pradeep Subedi and Minjie Ma and Sangita Kalarickal and Rea, {Chris J.} and Dimitrov, {Dimitar V.} and Huang, {Pin Wei} and Kangkang Wang and Xi Chen and Chubing Peng and Weibin Chen and Dykes, {John W.} and Seigler, {Mike A.} and Gage, {Edward C.} and Roy Chantrell and Thiele, {Jan Ulrich}",

year = "2015",

month = nov,

day = "1",

doi = "10.1109/TMAG.2015.2439690",

language = "English",

volume = "51",

pages = "1--9",

journal = "IEEE Transactions on Magnetics",

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Ju, G, Peng, Y, Chang, EKC, Ding, Y, Wu, AQ, Zhu, X, Kubota, Y, Klemmer, TJ, Amini, H, Gao, L, Fan, Z, Rausch, T, Subedi, P, Ma, M, Kalarickal, S, Rea, CJ, Dimitrov, DV, Huang, PW, Wang, K, Chen, X, Peng, C, Chen, W, Dykes, JW, Seigler, MA, Gage, EC, Chantrell, R & Thiele, JU 2015, 'High Density Heat-Assisted Magnetic Recording Media and Advanced Characterization - Progress and Challenges', IEEE Transactions on Magnetics, vol. 51, no. 11, 7115916, pp. 1-9. https://doi.org/10.1109/TMAG.2015.2439690

TY - JOUR

T1 - High Density Heat-Assisted Magnetic Recording Media and Advanced Characterization - Progress and Challenges

AU - Ju, Ganping

AU - Peng, Yingguo

AU - Chang, Eric K C

AU - Ding, Yinfeng

AU - Wu, Alexander Q.

AU - Zhu, Xiaobin

AU - Kubota, Yukiko

AU - Klemmer, Timothy J.

AU - Amini, Hassib

AU - Gao, Li

AU - Fan, Zhaohui

AU - Rausch, Tim

AU - Subedi, Pradeep

AU - Ma, Minjie

AU - Kalarickal, Sangita

AU - Rea, Chris J.

AU - Dimitrov, Dimitar V.

AU - Huang, Pin Wei

AU - Wang, Kangkang

AU - Chen, Xi

AU - Peng, Chubing

AU - Chen, Weibin

AU - Dykes, John W.

AU - Seigler, Mike A.

AU - Gage, Edward C.

AU - Chantrell, Roy

AU - Thiele, Jan Ulrich

PY - 2015/11/1

Y1 - 2015/11/1

N2 - Heat-assisted magnetic recording (HAMR) is being developed as the next generation magnetic recording technology. Critical components of this technology, such as plasmonic near-field transducer (NFT) and high anisotropy granular FePt media, as well as the performance and reliability of fully integrated drives have been reported. This paper will focus on the progress and challenges of HAMR media, including microstructure and thermal design as well as the testing and characterization at high field and high temperature. Due to the importance of the Curie temperature distribution, \sigma T{C} , for HAMR, we present a newly developed temperature-dependent complex ac susceptibility method to extract \sigma T{C} for HAMR media. Such novel magnetic characterization methods have been used in combination with other high field magnetic metrology and spin-stand recording to provide feedback for continuous improvements of HAMR media. Together with NFT and write head design, the thermal design, \sigma T{C} , and microstructure of the media are key factors to reduce the transition jitter below 2 nm as demonstrated in a previously reported 1 Tb/in2 HAMR demonstration. Here, we report the further improvements by significantly enabling higher linear density (>2500 kfci) HAMR and steady progress in areal density to 1.402 Tb/in2.

AB - Heat-assisted magnetic recording (HAMR) is being developed as the next generation magnetic recording technology. Critical components of this technology, such as plasmonic near-field transducer (NFT) and high anisotropy granular FePt media, as well as the performance and reliability of fully integrated drives have been reported. This paper will focus on the progress and challenges of HAMR media, including microstructure and thermal design as well as the testing and characterization at high field and high temperature. Due to the importance of the Curie temperature distribution, \sigma T{C} , for HAMR, we present a newly developed temperature-dependent complex ac susceptibility method to extract \sigma T{C} for HAMR media. Such novel magnetic characterization methods have been used in combination with other high field magnetic metrology and spin-stand recording to provide feedback for continuous improvements of HAMR media. Together with NFT and write head design, the thermal design, \sigma T{C} , and microstructure of the media are key factors to reduce the transition jitter below 2 nm as demonstrated in a previously reported 1 Tb/in2 HAMR demonstration. Here, we report the further improvements by significantly enabling higher linear density (>2500 kfci) HAMR and steady progress in areal density to 1.402 Tb/in2.

KW - BTD demo

KW - FePtX media

KW - HAMR (Heat assisted magnetic recording)

KW - media microstructure

KW - NFT (Near field transducer)

KW - TC distributions

KW - thermal design

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High Density Heat-Assisted Magnetic Recording Media and Advanced Characterization - Progress and Challenges

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Keywords

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Roy William Chantrell

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High Density Heat-Assisted Magnetic Recording Media and Advanced Characterization - Progress and Challenges

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Roy William Chantrell

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