Abstract
A review is provided of recent time-resolved scanning Kerr microscopy experiments and micromagnetic simulations of magnetization dynamics in single nanomagnets, and in pairs of dipolar coupled nanomagnets. Two nanomagnet systems are presented. In a single 440 nm square, the effect of the pulsed field amplitude on the relative amplitudes of center- and edge-type confined spin wave modes is explored. In addition, the difference in the damping of dynamics observed in different magnetic ground states is discussed. In pairs of 300 nm disks, the relative effect of structural imperfections and static dipolar fields on the splitting of edge-modes is investigated as a function of disk separation.
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Notes
- 1.
The spot size was determined by measuring the reflectivity as the laser spot was scanned across the edge of a thin film metallic structure fabricated on a Si substrate. The derivative of the change in reflectivity is Gaussian and the measured full-width at half maximum provides an estimate of the spatial resolution of the system. At a probe wavelength of 800 and 400 nm, the spot size is ∼500 and ∼300 nm, respectively.
- 2.
The mechanical drift was determined by measuring a scanning reflectivity image of an array of 640 nm squares with 240 nm edge-to-edge separation. The distortion of the image over the period of an hour due to mechanical drift was not more than 200 nm.
- 3.
The 300 nm disks were fabricated by J. Grollier and C. Ulysse. The 440 nm square was fabricated by J.R. Childress and J.A. Katine.
- 4.
The diameter was chosen to be slightly different to the nominal experimental value of 300 nm since some variation in diameter of this order is observed in the SEM images and because the vortex state forms more easily in the simulations for this smaller diameter.
References
P.S. Keatley, V.V. Kruglyak, A. Neudert, E.A. Galaktionov, R.J. Hicken, J.R. Childress, J.A. Katine, Phys. Rev. B 78, 214412 (2008)
V.V. Kruglyak, P.S. Keatley, A. Neudert, R.J. Hicken, J.R. Childress, J.A. Katine, Phys. Rev. Lett. 104, 027201 (2010)
S. Tacchi, M. Madami, G. Gubbiotti, G. Carlotti, H. Tanigawa, T. Ono, M.P. Kostylev, Phys. Rev. B 82, 024401 (2010)
R. Zivieri, F. Montoncello, L. Giovannini, F. Nizzoli, S. Tacchi, M. Madami, G. Gubbiotti, G. Carlotti, A.O. Adeyeye, Phys. Rev. B 83, 054431 (2011)
V.V. Kruglyak, A. Barman, R.J. Hicken, J.R. Childress, J.A. Katine, Phys. Rev. B 71, 220409(R) (2005)
G. Gubbiotti, M. Madami, S. Tacchi, G. Carlotti, A.O. Adeyeye, S. Goolaup, N. Singh, A.N. Slavin, J. Magn. Magn. Mater. 316, 338 (2007)
C.P. Burrows, W.L. Barnes, Opt. Express 18, 3187–3198 (2010)
J.M. Shaw, T.J. Silva, M.L. Schneider, R.D. McMichael, Phys. Rev. B 79, 184404 (2009)
H.T. Nembach, J.M. Shaw, T.J. Silva, W.L. Johnson, S.A. Kim, R.D. McMichael, P. Kabos, Phys. Rev. B 83, 094427 (2011)
A. Barman, S. Wang, J.D. Maas, A.R. Hawkins, S. Kwon, A. Liddle, J. Bokor, H. Schmidt, Nano Lett. 6, 2939–2944 (2006)
P.S. Keatley, P. Gangmei, M. Dvornik, R.J. Hicken, J.R. Childress, J.A. Katine, Appl. Phys. Lett. 98, 082506 (2011)
J.R. Childress, R.E. Fontana Jr., C. R. Phys. 6, 997–1012 (2005)
A. Dussaux, B. Georges, J. Grollier, V. Cros, A.V. Khvalkovskiy, A. Fukushima, M. Konoto, H. Kubota, K. Yakushiji, S. Yuasa, K.A. Zvezdin, K. Ando, A. Fert, Nat. Commun. 1, 8 (2010)
V.V. Kruglyak, P.S. Keatley, R.J. Hicken, J.R. Childress, J.A. Katine, Phys. Rev. B 75, 024407 (2007)
H. Schultheiss, C.W. Sandweg, B. Obry, S. Hermsdorfer, S. Schafer, B. Leven, B. Hillebrands, J. Phys. D, Appl. Phys. 41, 5 (2008)
M. Donahue, D.G. Porter, OOMMF user’s guide, Version 1.0. NISTIR 6376 (National Institute of Standards and Technology, Gaithersburg, MD 1999), see http://math.nist.gov/oommf
V.E. Demidov, M. Buchmeier, K. Rott, P. Krzysteczko, J. Münchenberger, G. Reiss, S.O. Demokritov, Phys. Rev. Lett. 104, 217203 (2010)
P.S. Keatley, P. Gangmei, M. Dvornik, R.J. Hicken, C. Ulysse, J. Grollier, Isolating the dynamic dipolar interaction between a pair of nanoscale ferromagnetic disks, submitted for publication
R.D. McMichael, B.B. Maranville, Phys. Rev. B 74, 024424 (2006)
Acknowledgements
The authors gratefully acknowledge the financial support from the EU grant MASTER NMP-FP7-212257, and the UK Engineering and Physical Sciences Research Council.
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Keatley, P.S. et al. (2013). Bottom up Magnonics: Magnetization Dynamics of Individual Nanomagnets. In: Demokritov, S., Slavin, A. (eds) Magnonics. Topics in Applied Physics, vol 125. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30247-3_2
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