Microwave assisted magnetization reversal in composite media

Shaojing Li; Livshitz, Boris; Bertram, H. Neal; Schabes, Manfred; Schrefl, Thomas; Fullerton, Eric E.; Lomakin, Vitaliy
May 2009
Applied Physics Letters;5/18/2009, Vol. 94 Issue 20, p202509
Academic Journal
Magnetic reversal in exchange-coupled composite elements under microwave fields is characterized by several unique properties including reduced reversal fields, microwave fields, microwave resonant frequencies, and reduced sensitivity to anisotropy distributions as compared to homogeneous elements. We find that reversal can occur in uniform and nonuniform regimes. The uniform regime is characterized by coherent spin precession enhancement by the microwave field. In the nonuniform regime domain walls in the soft layer mediate reversal and under linearly polarized microwave fields, can lead to a formation of localized reversal/nonreversal areas in the “applied field-frequency” phase plane.


Related Articles

  • Perpendicular magnetization reversal, magnetic anisotropy, multistep spin switching, and domain nucleation and expansion in Ga1-xMnxAs films. Liu, X.; Lim, W. L.; Titova, L. V.; Dobrowolska, M.; Furdyna, J. K.; Kutrowski, M.; Wojtowicz, T. // Journal of Applied Physics;9/15/2005, Vol. 98 Issue 6, p063904 

    We present a comprehensive study of the reversal process of perpendicular magnetization in thin layers of the ferromagnetic semiconductor Ga1-xMnxAs. For this investigation we have purposely chosen Ga1-xMnxAs with a low Mn concentration (x≈0.02), since in such specimens contributions of...

  • Magnetic phase diagram of a ferromagnet-antiferromagnet-ferromagnet spin-valve structure with rough interfaces. Morosov, A. I.; Morosov, I. A. // Physics of the Solid State;Oct2008, Vol. 50 Issue 10, p1924 

    The thickness-roughness phase diagram of a ferromagnet-antiferromagnet-ferromagnet spinvalve system is studied in the case where the roughness of the interfaces between the layers causes frustration of the exchange interaction between them. It is shown that the inclusion of easy-axis single-ion...

  • Modification of the ferromagnetic anisotropy and exchange bias field of NiFe/CoO/Co trilayers through the CoO spacer thicknesses. Lin, K.-W.; Lan, T.-C.; Shueh, C.; Skoropata, E.; van Lierop, J. // Journal of Applied Physics;2014, Vol. 115 Issue 17, p17D717-1 

    We have investigated the magnetism of NiFe/CoO/Co trilayers with different CoO spacer thicknesses. The dependence of the coercivity (Hc) and exchange bias field (Hex) on the CoO thicknesses indicated that different pinning strengths from the CoO were acting on the top NiFe and bottom Co layers,...

  • Temperature control of local magnetic anisotropy in multiferroic CoFe/BaTiO3. Lahtinen, Tuomas H. E.; van Dijken, Sebastiaan // Applied Physics Letters;3/18/2013, Vol. 102 Issue 11, p112406 

    This paper reports on the temperature evolution of local elastic interactions between ferromagnetic CoFe films and ferroelectric BaTiO3 substrates. Polarization microscopy measurements indicate that growth-induced stripe domains in the CoFe films are preserved and strengthened during cooling and...

  • Influence of induced anisotropy on the processes of magnetization reversal of cobalt circular nanodots. Ivanov, Yu. P.; Il'in, A. I.; Pustovalov, E. V.; Chebotkevich, L. A. // Physics of the Solid State;Aug2010, Vol. 52 Issue 8, p1694 

    The magnetic structure and the processes of magnetization reversal of individual cobalt nanodots and arrays of cobalt nanodots have been studied using the magneto-optical Kerr effect and magnetic force microscopy. Arrays of nanodots have been prepared by ion etching from a continuous cobalt...

  • The interface effect of the magnetic anisotropy in ultrathin epitaxial Fe3O4 film. Huang, Z. C.; Zhai, Y.; Lu, Y. X.; Li, G. D.; Wong, P. K. J.; Xu, Y. B.; Xu, Y. X.; Zhai, H. R. // Applied Physics Letters;3/17/2008, Vol. 92 Issue 11, p113105 

    The magnetic anisotropy of epitaxial layered structures of Fe3O4(tFe=4 nm)/GaAs(100), MgO(3 nm)/Fe3O4(tFe=4 nm)/GaAs(100), and Fe3O4(tFe=4 nm)/MgO(3 nm)/Fe3O4(tFe=4 nm)/GaAs(100) was studied by ferromagnetic resonance. It was shown that a predominant in-plane uniaxial magnetic anisotropy and a...

  • First-principle description of magnonic PdnFem multilayers. Manchanda, P.; Sahota, P. K.; Skomski, R.; Anil Kumar, P. S.; Kashyap, A. // Journal of Applied Physics;Apr2011, Vol. 109 Issue 7, p07C110 

    Ab-initio calculations are used to determine the parameters that determine magnonic band structure of PdnFem multilayers (n = 2, m ≤ 8). We obtain the layer-resolved magnetization, the exchange coupling, and the magnetic anisotropy of the Pd-Fe structures. The Fe moment is 3.0 μB close...

  • Micromagnetic simulations of spin-wave normal modes and the spin-transfer-torque driven magnetization dynamics of a ferromagnetic cross. Pramanik, Tanmoy; Roy, Urmimala; Tsoi, Maxim; Register, Leonard F.; Banerjee, Sanjay K. // Journal of Applied Physics;2014, Vol. 115 Issue 17, p17D123-1 

    We studied spin-transfer-torque (STT) switching of a cross-shaped magnetic tunnel junction in a recent report [Roy et al., J. Appl. Phys. 113, 223904 (2013)]. In that structure, the free layer is designed to have four stable energy states using the shape anisotropy of a cross. STT switching...

  • Control of domain wall pinning by switchable nanomagnet state. van Mourik, R. A.; Rettner, C. T.; Koopmans, B.; Parkin, S. S. P. // Journal of Applied Physics;2014, Vol. 115 Issue 17, p17D503-1 

    We report on a novel approach to establish switchable pinning of magnetic domain walls in a nanowire with perpendicular magnetic anisotropy by a single in-plane magnetized single-domain nanomagnet positioned on top of the wire. Devices were prepared by depositing a permalloy nanomagnet on top of...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics