DocumentCode :
1037707
Title :
Newly developed hot-pressed ferrite head
Author :
Sugaya, Hiroshi
Author_Institution :
Matsushita Electric Industrial Company, Ltd., Osaka, Japan
Volume :
4
Issue :
3
fYear :
1968
fDate :
9/1/1968 12:00:00 AM
Firstpage :
295
Lastpage :
301
Abstract :
A new type of ferrite called hot pressed ferrite (HPF) which is processed at a very high temperature and pressure during sintering, and which has almost the same density and lack of porosity as single crystal ferrite is described. Furthermore, HPF has many advantages over single-crystal ferrites, including the fact that it is isotropic. The permeability, expansion coefficients, and wearing characteristics of an HPF ingot are identical in all directions, which facilitates head design and manufacture. The magnetic, physical, and ether properties of HPF are described in detail and these properties are compared with those of conventional, high-density, and single-crystal ferrites. The way HPF can be used to design heads giving improved signal-to-noise ratio, higher resolution, and exceptionally long life is also described. The experimental results relate mainly to heads for audio, video, and instrumentation recording.
Keywords :
Ferrite devices; Magnetic recording heads; Video recording; Ferrites; Instruments; Magnetic heads; Magnetic properties; Manufacturing; Permeability; Signal design; Signal resolution; Signal to noise ratio; Temperature;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.1968.1066276
Filename :
1066276
Link To Document :
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