Demonstration of ultra-high-resolution MFM images using Co90Fe10-coated CNT probes

Sang Jun Choi; Ki Hong Kim; Young Jin Cho; Hu san Lee; Soo haeng Cho; Soon Ju Kwon; Jung hwan Moon; Kyoung Jin Lee

doi:10.1016/j.jmmm.2009.09.052

Demonstration of ultra-high-resolution MFM images using Co₉₀Fe₁₀-coated CNT probes

Sang Jun Choi, Ki Hong Kim, Young Jin Cho, Hu san Lee, Soo haeng Cho, Soon Ju Kwon, Jung hwan Moon, Kyoung Jin Lee

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

8 Citations (Scopus)

Abstract

We demonstrate ultra-high-resolution magnetic force microscopy images of perpendicular magnetic storage media using carbon nanotube probes coated by ferromagnetic Co₉₀Fe₁₀ films (20, 30, 40, and 50 nm). By optimizing ferromagnetic film thickness (effective tip diameter), we obtained best magnetic domain image with an 40 nm-Co₉₀Fe₁₀-coated tip (50 nm tip diameter) about a lateral detect density of 1200 k flux per inch on perpendicular magnetic storage medium, one of the highest resolutions in MFM imaging reported for this material system and structure. The observed dependence of tip dimension on signal contrast and image resolution was successfully explained by a theoretical analysis indicating that the signal contrast, along with the physical probe-tip dimension, should be taken into account to design magnetic probes tips for high-resolution magnetic force microscopy.

Original language	English
Pages (from-to)	332-336
Number of pages	5
Journal	Journal of Magnetism and Magnetic Materials
Volume	322
Issue number	3
DOIs	https://doi.org/10.1016/j.jmmm.2009.09.052
Publication status	Published - 2010 Feb

Bibliographical note

Funding Information:
This research was supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, Republic of Korea.

Keywords

CNT probe
CoFe
FCI
MFM
Magnetization value

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1016/j.jmmm.2009.09.052

Cite this

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title = "Demonstration of ultra-high-resolution MFM images using Co90Fe10-coated CNT probes",

abstract = "We demonstrate ultra-high-resolution magnetic force microscopy images of perpendicular magnetic storage media using carbon nanotube probes coated by ferromagnetic Co90Fe10 films (20, 30, 40, and 50 nm). By optimizing ferromagnetic film thickness (effective tip diameter), we obtained best magnetic domain image with an 40 nm-Co90Fe10-coated tip (50 nm tip diameter) about a lateral detect density of 1200 k flux per inch on perpendicular magnetic storage medium, one of the highest resolutions in MFM imaging reported for this material system and structure. The observed dependence of tip dimension on signal contrast and image resolution was successfully explained by a theoretical analysis indicating that the signal contrast, along with the physical probe-tip dimension, should be taken into account to design magnetic probes tips for high-resolution magnetic force microscopy.",

keywords = "CNT probe, CoFe, FCI, MFM, Magnetization value",

author = "Choi, {Sang Jun} and Kim, {Ki Hong} and Cho, {Young Jin} and Lee, {Hu san} and Cho, {Soo haeng} and Kwon, {Soon Ju} and Moon, {Jung hwan} and Lee, {Kyoung Jin}",

note = "Funding Information: This research was supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, Republic of Korea.",

year = "2010",

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AU - Choi, Sang Jun

AU - Kim, Ki Hong

AU - Cho, Young Jin

AU - Lee, Hu san

AU - Cho, Soo haeng

AU - Kwon, Soon Ju

AU - Moon, Jung hwan

AU - Lee, Kyoung Jin

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AB - We demonstrate ultra-high-resolution magnetic force microscopy images of perpendicular magnetic storage media using carbon nanotube probes coated by ferromagnetic Co90Fe10 films (20, 30, 40, and 50 nm). By optimizing ferromagnetic film thickness (effective tip diameter), we obtained best magnetic domain image with an 40 nm-Co90Fe10-coated tip (50 nm tip diameter) about a lateral detect density of 1200 k flux per inch on perpendicular magnetic storage medium, one of the highest resolutions in MFM imaging reported for this material system and structure. The observed dependence of tip dimension on signal contrast and image resolution was successfully explained by a theoretical analysis indicating that the signal contrast, along with the physical probe-tip dimension, should be taken into account to design magnetic probes tips for high-resolution magnetic force microscopy.

KW - CNT probe

KW - CoFe

KW - FCI

KW - MFM

KW - Magnetization value

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