Observation of stray fields from hard-disk writer poles up to 2 GHz

M. R. Koblischka; J. D. Wei; T. Sulzbach; A. D. Johnston; U. Hartmann

doi:10.1109/TMAG.2007.894122

Observation of stray fields from hard-disk writer poles up to 2 GHz

M. R. Koblischka, J. D. Wei, T. Sulzbach, A. D. Johnston, U. Hartmann

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

13 Citations (Scopus)

Abstract

By means of high-frequency magnetic force microscope (HF-MFM) the emanating stray fields from hard-disk writer poles are measured at carrier frequencies up to 2 GHz. For the present measurements, hard-disk writer poles stemming from SEAGATE were employed. At 1000 MHz and above, the field directly at the gap is dominating, while the fields along the downtrack direction are found to decrease. The observation of the stray fields at these high frequencies is only possible by employing MFM cantilevers with a 50-nm-thick (Ni,Zn)-ferrite coating. We show that the use of these tips gives much larger signal than those obtained by conventional CoCr-coated cantilevers.

Original language	English
Pages (from-to)	2205-2207
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	43
Issue number	6
DOIs	https://doi.org/10.1109/TMAG.2007.894122
Publication status	Published - 2007 Jun
Externally published	Yes

Keywords

Frequency characteristics
Hard-disk write head
High-frequency measurement
Magnetic force microscope

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2007.894122

Cite this

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title = "Observation of stray fields from hard-disk writer poles up to 2 GHz",

abstract = "By means of high-frequency magnetic force microscope (HF-MFM) the emanating stray fields from hard-disk writer poles are measured at carrier frequencies up to 2 GHz. For the present measurements, hard-disk writer poles stemming from SEAGATE were employed. At 1000 MHz and above, the field directly at the gap is dominating, while the fields along the downtrack direction are found to decrease. The observation of the stray fields at these high frequencies is only possible by employing MFM cantilevers with a 50-nm-thick (Ni,Zn)-ferrite coating. We show that the use of these tips gives much larger signal than those obtained by conventional CoCr-coated cantilevers.",

keywords = "Frequency characteristics, Hard-disk write head, High-frequency measurement, Magnetic force microscope",

author = "Koblischka, {M. R.} and Wei, {J. D.} and T. Sulzbach and Johnston, {A. D.} and U. Hartmann",

note = "Funding Information: This work was supported by the EU-funded project “ASPRINT” under Contract NMP4-CT-2003-1601.",

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language = "English",

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AU - Koblischka, M. R.

AU - Wei, J. D.

AU - Sulzbach, T.

AU - Johnston, A. D.

AU - Hartmann, U.

N1 - Funding Information: This work was supported by the EU-funded project “ASPRINT” under Contract NMP4-CT-2003-1601.

PY - 2007/6

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N2 - By means of high-frequency magnetic force microscope (HF-MFM) the emanating stray fields from hard-disk writer poles are measured at carrier frequencies up to 2 GHz. For the present measurements, hard-disk writer poles stemming from SEAGATE were employed. At 1000 MHz and above, the field directly at the gap is dominating, while the fields along the downtrack direction are found to decrease. The observation of the stray fields at these high frequencies is only possible by employing MFM cantilevers with a 50-nm-thick (Ni,Zn)-ferrite coating. We show that the use of these tips gives much larger signal than those obtained by conventional CoCr-coated cantilevers.

AB - By means of high-frequency magnetic force microscope (HF-MFM) the emanating stray fields from hard-disk writer poles are measured at carrier frequencies up to 2 GHz. For the present measurements, hard-disk writer poles stemming from SEAGATE were employed. At 1000 MHz and above, the field directly at the gap is dominating, while the fields along the downtrack direction are found to decrease. The observation of the stray fields at these high frequencies is only possible by employing MFM cantilevers with a 50-nm-thick (Ni,Zn)-ferrite coating. We show that the use of these tips gives much larger signal than those obtained by conventional CoCr-coated cantilevers.

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KW - Hard-disk write head

KW - High-frequency measurement

KW - Magnetic force microscope

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Observation of stray fields from hard-disk writer poles up to 2 GHz

Abstract

Keywords

ASJC Scopus subject areas

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