Recording experiments on rare-earth transition-metal thin films studied with Lorentz microscopy

Conference · Fri Sep 01 04:00:00 EDT 1989 · IEEE (Institute of Electrical and Electronics Engineers) Transactions on Magnetics; (USA)

OSTI ID:5180779

Greidanus, F J.A.M.; Jacobs, B A.J.; Spruit, J H.M. ^[1]; Klahn, S ^[2]

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1. Philips Research Labs., Eindhoven (Netherlands)
2. Philips GmbH Forschungslaboratorium Hamburg, D-2000 Hamburg (DE)

Domains written thermomagnetically under recording conditions in rare-earth transition-metal thin films are studied with Lorentz microscopy. New technique in which the magneto-optical layer is deposited on specially prepared silicon wafer disks, provided with Si/sub 3/N/sub 4/ windows is described. This technique allows direct observation of the written domain patterns in the electron microscope. It is demonstrated that the nucleation process plays a crucial role when writing in TbFeCo. Different compositions, having different temperature dependencies of the magnetic properties, lead to remarkably different domain-formation behaviour. With the detailed insight into the shape and structure of domains obtained by Lorentz microscopy, carrier and noise levels obtained from recording experiments can be understood. This is demonstrated with data on GdTbFe. It is shown that magnetic-field modulation, apart from the advantage of direct overwrite, offers the possibility of very high density recording.

• OSTI ID: 5180779
• Report Number(s): CONF-890309--
• Conference Information: Journal Name: IEEE (Institute of Electrical and Electronics Engineers) Transactions on Magnetics; (USA) Journal Volume: 25:5
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
COBALT ALLOYS
ELECTRON MICROSCOPY
ELEMENTS
FILMS
GADOLINIUM ALLOYS
IRON ALLOYS
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MAGNETIC STORAGE DEVICES
MAGNETIC TAPES
MAGNETO-OPTICAL EFFECTS
MEMORY DEVICES
MICROSCOPY
NUCLEATION
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SEMIMETALS
SILICON
TEMPERATURE DEPENDENCE
TERBIUM ALLOYS
THIN FILMS