Electronic and magnetic structure of thin Ni films on Co/Cu(001)

被引:57
作者
Dhesi, SS [1 ]
Dürr, HA
van der Laan, G
Dudzik, E
Brookes, NB
机构
[1] SERC, Daresbury Lab, Magnet Spect Grp, Warrington WA4 4AD, Cheshire, England
[2] Univ York, Dept Phys, York YO1 5DD, N Yorkshire, England
[3] European Synchrotron Radiat Facil, F-38043 Grenoble, France
来源
PHYSICAL REVIEW B | 1999年 / 60卷 / 18期
关键词
D O I
10.1103/PhysRevB.60.12852
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The electronic and magnetic structure of ferromagnetic Ni films grown epitaxially on ultrathin Films of Co has been studied by x-ray-absorption spectroscopy (XAS) using circular polarization. The growth morphology of the films was verified using high-resolution low-energy electron diffraction and indicated an incomplete layer-by-layer growth mode for the Co and Ni films deposited on Cu(001). We report the presence of additional peaks in the x-ray magnetic circular dichroism (XMCD) as predicted by the configuration interaction model. The ground-state magnetic moments were obtained from the XMCD sum rules at the Ni 2p edge. For a film thickness below 2 ML the number of holes and the spin polarization (spin moment per hole) show a gradual decrease, while the orbital polarization (orbital moment per hole) and the spin-orbit interaction show a gradual increase in magnitude. The 6-eV satellite structure, which is present in the XAS and XMCD of bulk Ni, disappears for submonolayer coverages while the dichroism due to "diffuse magnetism" between the L-3 and L-3 edges is strongly enhanced. These observations are ascribed to changes in the hybridization (electronic mu;mg) as a function of film thickness, which influences the ground-state d(8) weight and the s-state spin polarization. The strongly increased orbital moment per spin provides a good measure for the degree of localization. It is shown that for Ni thin firms a localization of the wave function does not lead to an enhancement in the total magnetic moment, but, on the contrary, its value is twice as small as the bulk value. [S0163-1829(99)0521 1-8].
引用
收藏
页码:12852 / 12860
页数:9
相关论文
共 43 条
[1]  
ANDERSEN OK, 1977, PHYSICA B & C, V86, P249, DOI 10.1016/0378-4363(77)90303-5
[2]  
[Anonymous], PHYS REV LETT
[3]   TIGHT-BINDING APPROACH TO THE ORBITAL MAGNETIC-MOMENT AND MAGNETOCRYSTALLINE ANISOTROPY OF TRANSITION-METAL MONOLAYERS [J].
BRUNO, P .
PHYSICAL REVIEW B, 1989, 39 (01) :865-868
[4]   PERPENDICULAR MAGNETIC-ANISOTROPY IN PD/CO THIN-FILM LAYERED STRUCTURES [J].
CARCIA, PF ;
MEINHALDT, AD ;
SUNA, A .
APPLIED PHYSICS LETTERS, 1985, 47 (02) :178-180
[5]   SOFT-X-RAY MAGNETIC CIRCULAR-DICHROISM AT THE L2,3 EDGES OF NICKEL [J].
CHEN, CT ;
SETTE, F ;
MA, Y ;
MODESTI, S .
PHYSICAL REVIEW B, 1990, 42 (11) :7262-7265
[6]   EXPERIMENTAL CONFIRMATION OF THE X-RAY MAGNETIC CIRCULAR-DICHROISM SUM-RULES FOR IRON AND COBALT [J].
CHEN, CT ;
IDZERDA, YU ;
LIN, HJ ;
SMITH, NV ;
MEIGS, G ;
CHABAN, E ;
HO, GH ;
PELLEGRIN, E ;
SETTE, F .
PHYSICAL REVIEW LETTERS, 1995, 75 (01) :152-155
[7]  
DHESI SS, UNPUB
[8]   Element-specific magnetic anisotropy determined by transverse magnetic circular x-ray dichroism [J].
Durr, HA ;
Guo, GY ;
vanderLaan, G ;
Lee, J ;
Lauhoff, G ;
Bland, JAC .
SCIENCE, 1997, 277 (5323) :213-215
[9]   Spin and orbital magnetization in self-assembled Co clusters on Au(111) [J].
Dürr, HA ;
Dhesi, SS ;
Dudzik, E ;
Knabben, D ;
van der Laan, G ;
Goedkoop, JB ;
Hillebrecht, FU .
PHYSICAL REVIEW B, 1999, 59 (02) :R701-R704
[10]   Magneto-optical effects in transition metal systems [J].
Ebert, H .
REPORTS ON PROGRESS IN PHYSICS, 1996, 59 (12) :1665-1735