Accession Number:

ADP013369

Title:

Influence of the Laser Repetition Rate on Crystalline Structure, Composition, and Magnetic Properties of Laser Deposited Y3Fe5O12/Gd3Ga5O12(111) Films

Descriptive Note:

Conference proceedings

Corporate Author:

ROYAL INST OF TECHNOLOGY STOCKHOLM (SWEDEN) CONDENSED MATTER PHYSICS

Report Date:

2003-04-03

Pagination or Media Count:

7.0

Abstract:

Y3Fe5O12 YIG films have been deposited onto single crystal Gd3Ga5O12 GGG substrates by pulsed laser deposition. For a given set of experimental parameters, the oxygen background pressure and substrate temperature were optimized to achieve the narrowest ferromagnetic resonance FMR lines. The repetition rate was then varied from 10 to 50 Hz. There is a clear transition from films with low saturation magnetization 4 pi M sub S 300 Gs, high coercive fields Hsub C 20 Oe, and broad FMR lines Delta H 100 Oe to films with 4 pi Msub S 1400 Gs, 1400 Gs, Hsub C 10 Oe, and Delta H 10 Oe. This crossover occurs when the laser repetition rate is changed from 20 to 30 Hz. No significant differences could be detected in any of the other investigated properties crystalline structure, cation concentration ratio, and surface roughness do not depend on the repetition rate. Annealing experiments show that the films deposited at 10 and 20 Hz repetition rate are oxygen deficient. We loaded the film deposited at 20 Hz with oxygen, so that it reached the bulk value for 4 pi Msub S. The coercive field, however, remained large.

Subject Categories:

  • Physical Chemistry
  • Crystallography
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE