我們以自製的磁光柯爾效應儀 (SMOKE) 探測Ag超薄膜覆蓋於Co/Pt(111)樣品前後之表面磁性變化，並藉由歐傑電子能譜術 (AES) 鑑別樣品表面組成成分、計算薄膜厚度，以及低能量繞射電子儀 (LEED) 研究表面結構，升降溫系統與離子濺射進行退火效應與深度分析的實驗。
我們發現在1ML及2ML Co/Pt(111)其樣品磁化易軸在垂直樣品表面方向，近1ML的Ag覆蓋會增強矯頑力HC達到最大的幅度。而1ML Ag/1ML Co/Pt (111)經650K退火後，因Co-Pt合金的形成，室溫下polar方向的柯爾訊號增至退火前200％，但經710K退火的樣品則因室溫325K時HC大於外加磁場而量測不到柯爾訊號。至於1ML Ag/2.2ML Co/Pt (111)磁性變化則與1ML Ag/1ML Co/Pt(111)相類似，但因Co厚度增加使得居禮溫度由後者之710K提高至780K，此外室溫325時之HC尚小於外加磁場，故可量測到柯爾訊號。
3ML Co/Pt(111)則因Co薄膜呈三維島狀成長，使樣品磁化易軸提前轉為平行樣品表面的方向，但經1ML的Ag覆蓋後，產生spin reorientation transition (SRT)的現象，磁化易軸轉為垂直樣品表面的方向;同樣的現象在4ML Co/Pt(111)及5ML Co/Pt(111)中發現，並經由深度分析確定SRT的產生機制來自Ag覆蓋層的影響。同時我們也觀察Ag覆蓋後樣品升降溫過程的磁性變化，並在論文討論之。
而8ML Co/Pt(111)則在Ag覆蓋厚度達1.5ML層時，才量測到polar方向的柯爾訊號，我們推測Ag覆蓋層達1ML時已增強垂直磁異向性，只是HC大於外加磁場而量測不到訊號，隨著Ag覆蓋層厚度增加HC減小而測得柯爾訊號。此外我們並不確定是Ag-Co介面或者是量子效應干涉造成這樣的現象，值得再深入研究。

[1] D. Lambeth, in: G.C. Gadjipanayis (Ed.), Magnetic Hysteresis in Novel Magnetic Materials, NATO ASI Series E 338, 767 (1997)
[2] Rugian Wu, Chun Li and A. J. Freeman, J. Magn. Magn. Mater. 99,71 (1991)
[3] P. F. Caraia, J. Appl. Phys. 63, 5066 (1988)
[4] W. B. Zeper, F. J. A. M. Greidanus, P. F. Carcia and C. R. Fincher, J. Appl. Phys., 65, 4971 (1989)
[5] Sang-Koog Kim, Vladimir A. Chernov, Yang-Mo Koo, J. Magn. Magn. Mater. 170, L7 (1997)
[6] Allenspach, R., Stampanoni, M. and Bischof, A., Phys. Rev. Lett., 65, 3344 (1990)
[7] C. Chappert and P. Bruno, J. Appl. Phys. 64 (10), 5736 (1988)
[8] A. Kirilyuk, J. Ferré, V. Grolier, J. P. Jamet., D. Renard, J. Magn. Magn. Mater. 171, 45 (1997)
[9] N. C. Koon and B. T. Jonker, Phys. Rev. Lett., 59, 2463 (1987)
[10] S. Hashimoto, Y. Ochiai, and K. Aso, J. Appl. Phys. 66 (10), 4909 (1989)
[11] R. Atkinson, S. Pahirathan, I. W. Salter, P. J. Grundy, C. J. Tatnall, J. C. Lodder, Q. Meng, J. Magn. Magn. Mater. 162, 131 (1996)
[12] S. Hashimoto and Y. Ochiai, J. Magn. Magn. Mater. 88, 211 (1990)
[13] Jin-Hong Kim, Sung-Chul Shin, Jpn. J. Appl. Phys. 35, 342 (1996)
[14] G. Zangari, P. Bucher, N. Lecis, P.L. Cavallotti, L. Callegaro, E. Puppin, J. Magn. Magn. Mater. 157/158, 256 (1996)
[15] S. Yoshii and K. Egashira, IEEE Trans., MAG-10, 584 (1974)
[16] C. S. Shern, J. S. Tsay, H. Y. Her, Y. E. Wu and R. H. Chen, Surf. Sci. Lett., 429, L497 (1999)
[17] J. S. Tsay and C. S. Shern, J. Appl. Phys., 80, 3777 (1996)
[18] J. S. Tsay and C. S. Shern, Surf. Sci., 396, 313 (1998)
[19] J. S. Tsay and C. S. Shern, Surf. Sci., 396, 319 (1998)
[20] C. S. Shern, S. L. Chen, J. S. Tsay, and R. H. Chen, Phys. Rev. B, 58, 7328 (1998)
[21] C. S. Shern, J. S. Tsay, S. L. Chen, and Y. E. Wu, J. Appl. Phys., 85, 228 (1999)
[22] J. Ferré, J. P. Jamet, J. Pommier, P. Beauvillain, C. Chappert, R. Mégy, P.Veillet, J. Magn. Magn. Mater. 174, 77 (1997)
[23] L. Argile and G.E. Rhead, Surf. Sci. Rep. 10, 277 (1989)
[24] E. Bauer, Appl. Surf. Sci. 11/12, 479 (1982)
[25] 蔡萍實，國立台灣師範大學碩士論文 (1992)
[26] B. Dodson, Phys. Rev. B, 36, 6288 (1987)
[27] R. Shimizu, Jap. J. Appl. Phys., 22, 1631 (1983)
[28] S. D. Bader, J. Magn. Magn. Mater. 100, 440 (1991)
[29] E. T. Kulatov, Yu. A. Uspenskii, S. V. Halilov, J. Magn. Magn. Mater., 163, 331 (1996)
[30] B. Heinrich and J. A. C. Bland “Ultrathin Magnetic structures Ⅰ” Ch2
[31] 張喣，李學養，磁性物理學，Ch6 (1982)
[32] R. Lawerence Comstock, “Introduction to Magnetism and magnetic Recording” (1999)
[33] Ching-Ray Chang and D. R. Fredkin, J. Appl. Physw., 63, 3435 (1988)
[34] J. A. C Bland, B. Heinrich(Eds), “Ultrathin Magnetic Structures Ⅰ”, 66-68 (1994)
[35] H. J. G. Draaisma, W. J. M. de Jonge, J. Appl. Phys. 64, 3610 (1988)
[36] L. Neel, J. de Phys. Et le Rad. 15, 225 (1954)
[37] G. Etrl, J. Küppers, “Low Energy Electrons and Surface Chemistry” (1985)
[38] D. Chattarji, “The Theory of Auger Transitions”, London: Academic Press (1976)
[39] D. L. Walters and C. P. Bhalla, Phys. Rev, A3, 1919 (1971)
[40] D. Briggs and M. P. Seah, “Practical Surface Analysis 2nd “ (1990)
[41] M. P. Seah, J. Vac. Sci. Technol., 17, 16 (1980)
[42] Lawerence E. Davis, Noel C. MacDonald, Paul W. Palmberg, Gerald E. Riach and Roland E. Weber, “Handbook of Auger Electron Spectroscopy”, (1978)
[43] C. J. Powell, J. Electron Spectrosc., 47, 197 (1988)
[44] A. Jablonski and H. Ebel, Surf. Interface Anal., 11, 627 (1988)
[45] C. J. Powell, Surf. Sci., 299/300, 34 (1994)
[46] S. Tanuma, C. J. Powell and D. R. Penn, J. Vac. Sci. Technol. A, 8, 2213 (1990)
[47] S. Tanuma, C. J. Powell and D. R. Penn, Surf. Interface Anal., 20, 77 (1993)
[48] S. Ichimura and R. Shimizu, Surf. Sci., 112, 386 (1981)
[49] J. A. Bearden and A. F. Burr, Rev. Mod. Phys., 39, 125 (1967)
[50] M. P. Seah, /surf. Sci., 32, 703 (1972)
[51] 潘扶民，儀器總覽—表面分析儀器，1 (1998)
[52] Charles Kittel, “Introduction to Solid State Physics” (1991)
[53] 盧治權，儀器總覽—表面分析儀器，50 (1998)
[54] Z. Q. Qiu, J. Pearson and S.D. Bader, Phys. Rev. B. 45, 7211 (1992)
[55] P. Grutter, U. T. Barrett, R. Belkhou, C. Guillot and H. Koundi, J. Phys. condens. matter (1994)
[56] J. S. Tsay and C. S. Shern, Chinese Journal of Physics, 34, No.2-Ⅰ
[57] H. Roder, R. Schuster, H. Brune, and K. Kem, Phys. Rev. Lett. 71, 2086 (1993)
[58] R. Schuster, H. Roder, H. Brune, and K. Kem, Phys. Rev. B 54, 13476 (1996)
[59] V. Grolier, J. Ferré, A. Maziewskl, E. Stefanowicz, and D. Renard, J. Appl. Phys., 73, 5939 (1993)
[60] C. Train, R. Mégy, C. Chappert, J. Magn. Magn. Mater., 202, 321 (1999)
[61] Tsu-Yi Fu, T. F. Liu, C. W. Su, C. S. Shern, R. H. Chen, Surf. Sci., 464, 211 (2000)
[62] Brad N. Engel, Michael H. Wiedmann, Robert A. Van Leeuwen, and Charles M. Falco, J. Appl. Phys., 73, 6192 (1993)
[63] Y. J. Chen, T. Suzuki, S. P. Wong and H. Sang, J. Appl. Phys., 85, 5048 (1999)
[64] S. Honda, M. Nawate, M. Tanaka and T. Okada, J. Appl. Phys., 82, 764 (1997)
[65] H. Brandle, D. Weller, J.C. Scott, S.S.P. Parkin, C. –J. Lin, IEEE Trans. Magn. 28, 2967 (1992)
[66] W.J.M. de Jonge, P.J.H. Bloemen, F.J.A. den Broeder, in: J.A.C. Bland, B. Heinrich (Eds.), Ultrathin Magnetic Structures I, Springer, Berlin, 1994, and references cited therein
[67] U. Bovensiepen, Hyuk J. Choi, Z. Q. Qiu, phys. Rev. B, 61, 3235 (2000)
[68] A. Berger and H. Hopster, Phys. Rev. Lett. 76, 519 (1996); J. Appl. Phys. 79, 5619 (1996)
[69] G. Garreau, M. Farle, E. Beaurepaire, J.P. Kappler, J. Magn. Magn. Mater. 184, 289 (1998)
[70] M. Farle, B. Mirwald-Schulz, A. N. Anisimov, W. Platow, and K. Baberschke, Phys. Rev. B 55, 3708 (1997)
[71] W. Weber, C.H. Back, A. Bischof, D. Pescia, R. Allenspach, Nature 374, 788 (1995)
[72] W. Weber, C.H. Back, U. Ramsperger, A. Vaterlaus, R. Allenspach, Phys. Rev. B 48, R14400 (1995)
[73] S. Hope, E. Gu, B. Choi, J.A.C. Bland, Phys. Rev. Lerr. 80, 1750 (1998)
[74] Brad N. Engel, Michael H. Wiedmann, Rovert A. Van Leeuwen, and Charles M. Falco, Phys. Rev. B, 48, 9894 (1993)
[75] P. Beauvillain, A. Bounouh, C. Chappert, R. Megy, S. Ould-Mahfoud, J. P. Renard, P. Veillet, D. Weller, and J. Corno, J. Appl. Phys. 76, 6078 (1994)
[76] J. E. Ortega, F. J. Himpsel, G. J. Mankey, and R. F. Willis, Phys. Rev. B, 47, 1540 (1993)
[77] D. Hartmann, W. Weber, A. Rampe, S. Popovic, and G. Guntherodt, Phys. Rev. B, 48, 16837 (1993)