Magnetic properties of Ni clusters embedded in AlN by x-ray magnetic circular dichroism

Magnetic Ni clusters, with an average diameter of 1.9 nm, were prepared by ion implantation in a sintered AlN matrix. X-ray magnetic circular dichroism measurements were performed on this sample at 100 K and 300 K, by measuring the edges of Ni under a magnetic field of T. Using the sum rules currently applied to the bulk transition metals, we deduce a total magnetic moment and the orbital and spin contributions to this moment. The magnetic moment is in good agreement with the values measured by SQUID magnetometry at the same temperatures.

[1]  Yi Qiang,et al.  LETTER TO THE EDITOR: Quenching of ferromagnetism in cobalt clusters embedded in copper , 1997 .

[2]  A. Traverse.  Metallic clusters in the AlN ceramic , 1997 .

[3]  J. Stöhr,et al.  X-Ray Magnetic Circular Dichroism Spectroscopy of Transition Metal Multilayers , 1997 .

[4]  F. Jollet,et al.  The importance of the magnetic dipole term in magneto-circular x-ray absorption dichroism for 3d transition metal compounds , 1996 .

[5]  M. Arrio,et al.  Analytic calculation of the spin sum rule at the L2,3 edges of Cu2+ , 1995, Physical review. B, Condensed matter.

[6]  Chen,et al.  Experimental confirmation of the X-ray magnetic circular dichroism sum rules for iron and cobalt. , 1995, Physical review letters.

[7]  Shiv N. Khanna,et al.  Geometry, electronic structure, and magnetism of small Nin (n = 2–6, 8, 13) clusters , 1995 .

[8]  W. D. de Heer,et al.  Magnetism from the Atom to the Bulk in Iron, Cobalt, and Nickel Clusters , 1994, Science.

[9]  Wu,et al.  First principles investigation of the validity and range of applicability of the x-ray magnetic circular dichroism sum rule. , 1993, Physical review letters.

[10]  Thole,et al.  X-ray circular dichroism and local magnetic fields. , 1993, Physical review letters.

[11]  P. Carra.  Circular Magnetic X-ray Dichroism: a Sum Rule , 1993 .

[12]  Jiang,et al.  Giant magnetoresistance in nonmultilayer magnetic systems. , 1992, Physical review letters.

[13]  Young,et al.  Giant magnetoresistance in heterogeneous Cu-Co alloys. , 1992, Physical review letters.

[14]  Thole,et al.  X-ray circular dichroism as a probe of orbital magnetization. , 1992, Physical review letters.

[15]  C. Clerc,et al.  Progress report on Aramis, the 2 MV tandem at Orsay , 1992 .

[16]  H. Bernas,et al.  A medium energy facility for variable temperature implantation and analysis , 1981 .

[17]  J. Dormann.  Le phénomène de superparamagnétisme , 1981 .

[18]  C. P. Bean.  Hysteresis Loops of Mixtures of Ferromagnetic Micropowders , 1955 .