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Laser Annealing of Garnet Epitaxial Layers under Controlled Atmospheres for Device Applications

IP.com Disclosure Number: IPCOM000051689D
Original Publication Date: 1981-Feb-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

DeLuca, JC: AUTHOR [+4]

Abstract

Laser annealing can permanently alter the magnetic properties of Ga-substituted magnetic bubble epitaxial garnet films. Laser annealing such films causes their saturation magnetization (4 pi M(s)) to increase as a function of the applied laser power. This is evidenced in annealed films by a decrease in domain periodicity, and increase in bubble collapse field and changes in the ferromagnetic resonance (FMR) spectra.

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Laser Annealing of Garnet Epitaxial Layers under Controlled Atmospheres for Device Applications

Laser annealing can permanently alter the magnetic properties of Ga- substituted magnetic bubble epitaxial garnet films. Laser annealing such films causes their saturation magnetization (4 pi M(s)) to increase as a function of the applied laser power. This is evidenced in annealed films by a decrease in domain periodicity, and increase in bubble collapse field and changes in the ferromagnetic resonance (FMR) spectra.

These effects are attributed to the redistribution of the Ga(3+) and Fe(3+) cations between the tetrahedral and octahedral lattice sites. The laser first heats an area causing partial randomization of the Ga and Fe ions between sites. As the beam moves on, the previously heated region rapidly cools, quenching the high temperature ion distribution. Dramatic changes result from the use of different gas ambients for annealing. Laser annealing of magnetic bubble garnet films in atmospheres of forming gas, nitrogen, air and oxygen yields different laser power thresholds for physical damage to the samples. Annealing in O(2) allows the widest range, i.e., the highest laser power levels to be used, without causing damage to the garnet films. Films annealed in O(2), in comparison with other gases, show the greatest increase in 4 pi M(s) and the largest decrease in the quality factor (Q).

A Eu(0.6)Y(2.4)Ga(1.17)Fe(3.83)O(12) (nominal composition) bubble film
2.41 th...