AFM study of combinatorial Ga+ implanted Co7Ag93 film and its Kerr effect

AFM study of combinatorial Ga⁺ implanted Co₇Ag₉₃ film and its Kerr effect

CAI Ying-Wen，

GU Ming，

WEI Lun，

LI Jian-Guo，

LI Ai-Guo，

NI Xin-Bo，

ZHANG Gui-Lin，

WANG Song-You，

SHEN Zuo-Cheng，

LI Jing，

CHEN Liang-Yao

Nuclear Science and Techniques

Vol.13, No.3

pp.143-148

Published in print 01 Aug 2002

CLC：O482.55, O484.4, O572.21

22000

In this paper, a magnetooptic chip was prepared on Si wafer by combinatorial Ga⁺ implantation into ion sputtered Co₇Ag₉₃ film. The surface morphology of each unit of the chip was detected by AFM, while their Kerr effect was measmed by MOKE equipment. It is observed that the maximum Kerr rotation (MKR) occurs when the incident photon energy is around 3.8-3.9 eV. Summarization of MKR versus implanted Ga⁺ dose shows that the MKR enhancement by Ga+ implantation can be characterized as incubation, enhancement and saturation regions. Considering the mutual solubility and surface morphology transition after annealing, it is suggested that Ga⁺ tends to form CoGa and/or CoGa₃ intermetallic compounds. Before the formation of CoGa₃ compounds, no apparent MKR enhancement could be observed. While when the surface is half occupied by forest-like CoGa₃ compounds. MKR enhancement will be saturated. By comparison of the maximum Kerr rotation with the cone areal density, it can be induced that not only the bulk concentration and structure, but also the surface morphology plays an important role in magnetooptic Kerr effect.

Combinatorial ion implantationAFMMOKESurface morphology

References

Stearns M B, Cheng Y.

J Appl Phys, 1994, 75: 6894

Hanson M, Johansson C, Mφrup S.

J Phys Condens Matter, 1993, 5: 725

Chen J P, Sorensen C M, Klabunde K J.

Phys Rev, 1995, B51: 11527

Hou M, Azzaoui M E, Pattyn H et al. Phys Rev, 2000, B62: 5117

Jia H, Veldeman J, Burgelman M.

J Magn Magn Mater, 2001, 223: 73

Tessier G, Beauvillain P.

Appl Surf Sci, 2000, 164: 175

Du J H, Liu W J, Li Q et al. J Magn Magn Mater, 1999, 191: 17

Kemner K, Harris V, Chakarian V.

J Appl Phys, 1996, 79: 5345

O'Grady K, Laidle H.

J Magn Magn Mater, 1999, 200: 616

Qiu Z Q, Bader S D.

J Magn Magn Mater, 1999, 200: 664

Xiang X D, Sun X, Briceño G et al. Science, 1995, 268: 1738

ASM Handbook, Vol.3. Alloy phase Diagrams. Ohio: ASM, Materials Park, C1991

Wang S Y, Shen Z C, Zheng W M et al. Physica, 2000, B279: 109

Zheng W M, Wang S Y, Qian D L et al. J Magn Magn Mater, 1999, 198-199: 210

Shen Y R.

The principles of nonlinear optics, New York: Wiley, 1984