,716, 北京科技大学学报 第29卷 [3]Florczak M.Dan Dahlberg E.Dectecting two magnetization com- pendence of the oscillatory exchange interaction in Co/Cu/Co. ponents by the magnetio"optical Kerr effect.J Appl Phys.1990. Phys Rev Lett.1992.69:969 67,7520 [6]Altuncevahir B.Koymen A R.Interlayer coupling in CoNi/Gd/ [4]Daboo C.Bland J A C.Hicken R J.Vectorial magnetometry with CoNi trilayer.J Appl Phys.2001.89:6822 the magnetooptic Kerr effect applied to Co/Cu/Co trilayer strue- [7]Parkin SS P.Bhadra R.Rocher K P.Oscillatory magnetic ex- tures.Phys Rev B.1993.47:11852 change coupling through thin copper layers.Phys Rev Lett, [5]Johnson M T.Coehorn R.de Vries J J.et al.Orientational de- 1991,66:2152 Reversal process of magnetization of a Co/Cu/Co trilayer observed by longitudinal MOKE technique WA NG Yidong,WANG Lei,PAN Liging,WU Ping,QIU Hong,WANG Fengping Department of Physics,University of Science and Technology Beijing.Beijing 100083.China ABSTRACI A set of experimental system of magneto optic Kerr effect was set up mainly by using photo elastic modulator and lock in amplifier.The system was used to measure the magnetic properties of magnetic materials, especially for magnetic thin films.The longitudinal magneto optical Kerr effect was used to investigate the mag- netic properties and magnetic reversal.Transverse and longitudinal magnetic fields were applied in the plane of the samples in order to measure two perpendicular magnetization components in plane.Co/Cu/Co sandwiches deposited on different substrates were prepared by high vacuum magnetron sputtering.From Kerr loops,the different of structure between buffer and Cu layer induced the difference of structure between Co dow n-layer and Co up-layer,which made the coercive force difference and magnetization reversal. KEY WORDS magneto-optic Kerr effect;Co/Cu/Co sandwich:magnetic reversal［3］ Florczak M‚Dan Dahlberg E．Dectecting two magnetization com￾ponents by the magnetio-optical Kerr effect．J Appl Phys‚1990‚ 67：7520 ［4］ Daboo C‚Bland J A C‚Hicken R J．Vectorial magnetometry with the magneto-optic Kerr effect applied to Co／Cu／Co trilayer struc￾tures．Phys Rev B‚1993‚47：11852 ［5］ Johnson M T‚Coehorn R‚de Vries J J‚et al．Orientational de￾pendence of the oscillatory exchange interaction in Co／Cu／Co． Phys Rev Lett‚1992‚69：969 ［6］ Altuncevahir B‚Koymen A R．Interlayer coupling in CoNi／Gd／ CoNi trilayer．J Appl Phys‚2001‚89：6822 ［7］ Parkin S S P‚Bhadra R‚Rocher K P．Oscillatory magnetic ex￾change coupling through thin copper layers．Phys Rev Lett‚ 1991‚66：2152 Reversal process of magnetization of a Co／Cu／Co trilayer observed by longitudinal MOKE technique WA NG Y idong‚WA NG Lei‚PA N L iqing‚W U Ping‚QIU Hong‚WA NG Fengping Department of Physics‚University of Science and Technology Beijing‚Beijing100083‚China ABSTRACT A set of experimental system of magneto-optic Kerr effect was set up mainly by using photo-elastic modulator and lock-in amplifier．The system was used to measure the magnetic properties of magnetic materials‚ especially for magnetic thin films．The longitudinal magneto-optical Kerr effect was used to investigate the mag￾netic properties and magnetic reversal．Transverse and longitudinal magnetic fields were applied in the plane of the samples in order to measure two perpendicular magnetization components in-plane．Co／Cu／Co sandwiches deposited on different substrates were prepared by high vacuum magnetron sputtering．From Kerr loops‚the different of structure between buffer and Cu layer induced the difference of structure between Co down-layer and Co up-layer‚which made the coercive force difference and magnetization reversal． KEY WORDS magneto-optic Kerr effect；Co／Cu／Co sandwich；magnetic reversal ·716· 北 京 科 技 大 学 学 报 第29卷