Static and dynamic properties of magnetic bubble domains in Sm, Ca, Ge-substituted yttrium iron garnet films. [Y/sub 1/. /sub 9/Sm/sub 0/. /sub 1/Ca/sub 1/Fe/sub 4/Ge/sub 1/O/sub 12/]
Conference
·
· AIP (Am. Inst. Phys.) Conf. Proc.; (United States)
OSTI ID:7360472
The static and dynamic properties of magnetic bubble domains in garnet films of nominal composition Y/sub 1/./sub 9/Sm/sub 0/./sub 1/Ca/sub 1/Fe/sub 4/Ge/sub 1/O/sub 12/ grown by the LPE method on GGG substrates have been measured. The films supported 5--8 ..mu..m bubbles and collapse fields ranged from 60 to 110 Oe. The temperature coefficient ..cap alpha../sub bc/ of the collapse field became more negative with increasing T/sub C/; at T/sub C/ = 468/sup 0/K, ..cap alpha../sub bc/ = -0.11 percent//sup 0/C at 50/sup 0/C and parallel ..cap alpha../sub bc/ parallel increased by approximately 8.4 percent for a 1/sup 0/K increase in T/sub C/. Pulsed field gradient bubble velocity measurements were made on films as grown and after ion implantation with 2.5 x 10/sup 14/ Ne cm/sup -2/ at 100 keV energy. In almost all cases, bubbles having rotation number n/sub r/ = 1 were observed in ion-implanted films and n/sub r/ = 0 bubbles were seen in as-grown samples. There was little evidence of dynamic conversion for V less than V/sub p/ for repetitive measurements with a given bubble. However, for randomly selected bubbles there was greater scatter in velocity. Mobility values for drive fields less than or equal to 4.5 Oe ranged from about 1100 to 1400 cm s/sup -1/ Oe/sup -1/ withthe dynamic coercive force always less than 0.6 Oe.
- Research Organization:
- Allied Chemical Corp., Morristown, NJ
- OSTI ID:
- 7360472
- Conference Information:
- Journal Name: AIP (Am. Inst. Phys.) Conf. Proc.; (United States) Journal Volume: 29
- Country of Publication:
- United States
- Language:
- English
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