Structural and magnetic properties of laser-annealed magneto-optic thin films

In order to enhance the performance of rare-earth-transition-metal thin films, an attempt has been made to allow the as-sputtered film structure to relax by use of pulsed laser beam irradiation. This technique has several advantages over other forms of annealing, in particular the ability to tune th...

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Bibliographic Details
Published inIEEE transactions on magnetics Vol. 26; no. 5; pp. 1921 - 1923
Main Authors Haycock, P.W., Noyau, R.H., Thomson, T., Herdman, G.J., Williams, E.W., O'Grady, K.
Format Journal Article Conference Proceeding
LanguageEnglish
Published New York, NY IEEE 01.09.1990
Institute of Electrical and Electronics Engineers
Subjects
Annealing
Applied sciences
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Laser tuning
Magnetic confinement
Magnetic films
Magnetic properties
Magnetic properties and materials
Magnetooptic effects
Metals. Metallurgy
Physics
Saturation magnetization
Soft magnetic materials
Temperature
Transistors
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Summary:In order to enhance the performance of rare-earth-transition-metal thin films, an attempt has been made to allow the as-sputtered film structure to relax by use of pulsed laser beam irradiation. This technique has several advantages over other forms of annealing, in particular the ability to tune the laser wavelength to a region which is absorbing in only one layer of the disk, in order to confine the effects of the anneal to that layer. By tuning a laser to an absorbing wavelength in Tb-Fe-Co media it was possible to produce local transient temperatures up to 3000 degrees C, modifying the magnetic behavior of the samples without significantly affecting their macroscopic layer structure. Anneals to a temperature of about 690 degrees C were found to introduce an additional soft magnetic component to the hysteresis loop, doubling the values of both the saturation and the remanent magnetization. On the other hand, anneals near 3000 degrees C destroyed the perpendicular anisotropy. The structure has been probed by neutron and X-ray reflectivity measurements, and the magnetic properties have been studied by vibrating sample magnetometry.< >
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ISSN:0018-9464
1941-0069
DOI:10.1109/20.104570