NDLI: Investigation of ferrimagnetic materials at low temperatures and some applications in low-noise receivers

Content Provider	IEEE Xplore Digital Library
Author	Roth, D. Schedelbeck, W. Schollmeier, G.
Copyright Year	1965
Abstract	The microwave absorption of polycrystalline ferrimagnetic garnets has been measured at room temperature, at 77°K and at 4.2°K. Undoped and aluminium doped ytirium iron garnets (YIG, YIG-Al), mixed gadolinium-yttrium iron garnets (Gd-YIG), and calcium-vanadium-bismuth garnet (CVB) have been investigated. At a fixed frequency of 4.2 Gc/s the low-field losses and the resonance loss of disk-shaped samples were displayed as a function of the magnetic field using a magic T bridge. In all measurements on disks an unsymmetrical shape of the resonance curve or additional absorption peaks were observed. At room temperature a series of magnetostatic modes became excited ; at low temperatures anisotropy effects are believed to cause the disturbed line shape. For undoped YIG the absorption curve was similar, but it was broader at low temperatures. CVB turned out to have the smallest low-field losses of all materials investigated. These measurements have been performed in order to test and compare material properties essential in cryogenic temperature ferrimagnetic devices. The performance of resonance isolators for ruby traveling-wave masers using undoped YIG and of Y-junction circulators operating at cryogenic temperatures is reported. CVB has been found to be especially well fitted for below resonance circulators because of its small low-field losses.
Sponsorship	IEEE Magnetics Society
Starting Page	256
Ending Page	259
Page Count	4
File Size	509815
File Format	PDF
ISSN	00189464
Volume Number	2
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1966-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ferrimagnetic materials Garnets Magnetic resonance Temperature measurement Iron Magnetic field measurement Shape measurement Absorption Cryogenics Circulators
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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