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Si(+) ion irradiation in a Co/Pt multilayer system.

S Kavita¹, V Raghavendra Reddy, S Amirthapandian

¹UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore-452 017, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|August 6, 2011

Summary

Si(+) ion irradiation induces intermixing in Co/Pt multilayers. Higher temperatures promote the formation of CoPt(3) fcc and L1(0) phases, driven by ion-induced atomic mixing.

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Area of Science:

Materials Science
Surface Science
Ion Beam Modification

Background:

Multilayer systems like Cobalt/Platinum (Co/Pt) are crucial for magnetic storage media.
Understanding ion irradiation effects is key to tailoring material properties for advanced applications.
Interface engineering in magnetic multilayers requires precise control over structural and magnetic characteristics.

Purpose of the Study:

To investigate the impact of Silicon (Si(+)) ion irradiation on Co/Pt multilayer structure and properties.
To analyze the influence of irradiation temperature on the resulting phases and intermixing.
To elucidate the mechanisms of ion-induced mixing in Co/Pt systems.

Main Methods:

Characterization of as-deposited and irradiated Co/Pt samples using X-ray reflectivity (XRR).
Analysis of structural changes via X-ray diffraction (XRD).
Evaluation of magnetic properties using the magneto-optical Kerr effect (MOKE).

Main Results:

X-ray reflectivity confirmed significant intermixing at the Co/Pt interfaces post-irradiation.
X-ray diffraction revealed the formation of the Cobalt Platinum (CoPt(3)) face-centered cubic (fcc) phase at higher irradiation temperatures.
A small fraction of the L1(0) phase was also observed, indicating temperature-dependent phase evolution.
The mixing process is attributed to recoil displacements resulting from energy transfer during ion bombardment.

Conclusions:

Si(+) ion irradiation effectively modifies the structure of Co/Pt multilayers.
Irradiation temperature plays a critical role in phase formation and interface intermixing.
The findings provide insights into controlling the microstructure and properties of Co/Pt systems through ion beam processing.