Theory of collective spin waves and microwave response of ferromagnetic nanowire arrays

被引:42
作者
Arias, R [1 ]
Mills, DL [1 ]
机构
[1] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
来源
PHYSICAL REVIEW B | 2003年 / 67卷 / 09期
关键词
D O I
10.1103/PhysRevB.67.094423
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We formulate the theory of the collective spin wave modes and the microwave response of arrays of ferromagnetic nanowires of cylindrical cross section, each magnetized parallel to the axis of symmetry. The theory is based on a multiple scattering approach, and may be applied to the regime where the diameter of the constituents is small enough that exchange enters the response importantly. The formalism can be applied to ordered arrays, or disordered arrays of nanowires. We present explicit results for the spin wave normal mode frequencies of a pair of nanowires, and for a linear array. The dispersion curves for the collective modes in the latter case show a dispersive collective mode which crosses and hybridizes with resonances in the individual cylinders. For a nanowire pair, and in the magnetostatic limit, we obtain a closed form expression for the collective spin wave modes in the limit as the wavevector parallel to the symmetry axis vanishes. Interestingly, the resonance does not split as the wires are brought together, but just shifts downward in frequency, from the value gamma(H-0+2piM(s)) appropriate to the isolated wire at large separations, to gamma[H-0(H-0+4piM(s))](1/2) when the wires just touch.
引用
收藏
页数:15
相关论文
共 13 条
  • [1] Theory of spin excitations and the microwave response of cylindrical ferromagnetic nanowires (vol 63, art no 134439, 2001)
    Arias, R
    Mills, DL
    [J]. PHYSICAL REVIEW B, 2002, 66 (14):
  • [2] Theory of spin excitations and the microwave response of cylindrical ferromagnetic nanowires
    Arias, R
    Mills, DL
    [J]. PHYSICAL REVIEW B, 2001, 63 (13):
  • [3] Extrinsic contributions to the ferromagnetic resonance response of ultrathin films
    Arias, R
    Mills, DL
    [J]. PHYSICAL REVIEW B, 1999, 60 (10): : 7395 - 7409
  • [4] Brillouin light scattering studies of confined spin waves: linear and nonlinear confinement
    Demokritov, SO
    Hillebrands, B
    Slavin, AN
    [J]. PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2001, 348 (06): : 441 - 489
  • [5] EBELS U, 2001, PHYS REV B, V64
  • [6] SCATTERING BY A RANDOM SET OF PARALLEL CYLINDERS
    FELBACQ, D
    TAYEB, G
    MAYSTRE, D
    [J]. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION, 1994, 11 (09): : 2526 - 2538
  • [7] GRADSHETEYN IS, 1965, TABLE INTEGRALS SERI
  • [8] Self-assembled Fe nanowires using organometallic chemical vapor deposition and CaF2 masks on stepped Si(111)
    Lin, JL
    Petrovykh, DY
    Kirakosian, A
    Rauscher, H
    Himpsel, FJ
    Dowben, PA
    [J]. APPLIED PHYSICS LETTERS, 2001, 78 (06) : 829 - 831
  • [9] POLARITONS - ELECTROMAGNETIC MODES OF MEDIA
    MILLS, DL
    BURSTEIN, E
    [J]. REPORTS ON PROGRESS IN PHYSICS, 1974, 37 (07) : 817 - 926
  • [10] MILLS DL, 1984, SURFACE EXCITATIONS, pCH2