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

Conference · Fri Sep 01 00:00:00 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-; CODEN: IEMGA; TRN: 90-002058
• Journal Information: IEEE (Institute of Electrical and Electronics Engineers) Transactions on Magnetics; (USA), Vol. 25:5; Conference: INTERMAG: international magnetic conference, Washington, DC (USA), 28-31 Mar 1989; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

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