Recording Head Characterization Using a Narrow Domain Wall in Epitaxial Garnet Films

A domain wall in a ferromagnetic garnet film with high perpendicular anisotropy is used as a highly localized field source with nanometer extent. When the domain wall is moved crosstrack over the read sensor of a perpendicular recording head, the spatial response function of the sensor is measured....

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Bibliographic Details
Published in:IEEE transactions on magnetics 2009-10, Vol.45 (10), p.3652-3655
Main Authors: Heidmann, J., Taratorin, A.
Format: Article
Language:English
Subjects:
Anisotropic magnetoresistance
Coiling
Cross-disciplinary physics: materials science
rheology
Domain walls
Exact sciences and technology
Ferromagnetic materials
Frequency
garnet film
Garnet films
Garnets
Magnetic domain walls
Magnetic domains
Magnetic field measurement
Magnetic heads
Magnetic sensors
Magnetism
Materials science
Mathematical analysis
Oscillating
Other topics in materials science
Perpendicular magnetic recording
perpendicular recording heads
Physics
Recording heads
Sensor phenomena and characterization
Sensors
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Summary:A domain wall in a ferromagnetic garnet film with high perpendicular anisotropy is used as a highly localized field source with nanometer extent. When the domain wall is moved crosstrack over the read sensor of a perpendicular recording head, the spatial response function of the sensor is measured. From the response curve, the magnetic read width of the sensor can be calculated and details of the response can reveal local sensor instabilities. By oscillating the domain wall at a frequency of a few megahertz, the method can also be applied to write-head testing when the write pole is subjected to the field from the oscillating domain wall and the induced voltage in the write coil is measured.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2009.2023066