Magnetization distribution in Nd4.5Fe77B18.5 nanocomposite magnets studied by electron holography

Park, Y.-G.; Shindo, D.; Kanekiyo, H.; Hirosawa, S.
November 2004
Applied Physics Letters;11/29/2004, Vol. 85 Issue 22, p5302
Academic Journal
Magnetic nanostructures at demagnetized and remanent states in Nd4.5Fe77B18.5 nanocomposite magnets are investigated by electron holography, utilizing the specially designed electromagnet. The quantitative mapping of magnetization distribution at a nanometer scale using a polar diagram has been reported for both the demagnetized and remanent states. Through the polar diagrams for the remanent state, the homogeneous distribution of magnetic flux is found in the specimen annealed at a low temperature, while the fluctuated distribution is found in the specimen annealed at a high temperature. The difference is considered to be responsible for their magnetic properties, i.e., remanence and coercivity.


Related Articles

  • The process-controlled magnetic properties in nanostructured Fe/Ag composite films. Zhang, Y. X.; Liou, S. H.; DeAngelis, R. J.; Lee, K. W.; Reed, C. P.; Nazareth, A. // Journal of Applied Physics;4/15/1991, Vol. 69 Issue 8, p5273 

    Discusses a study that tested the magnetic properties in nanostructured iron/silver composite films. Correlations between the microstructure and magnetic properties; Effects of cluster-size distribution in the films; Formation of the nanostructured composite material by the mixing of two...

  • Nanocomposite CoPt:C films for extremely high-density recording. Yu, M.; liu, Y.; Moser, A.; Weller, D.; Sellmyer, D.J. // Applied Physics Letters;12/20/1999, Vol. 75 Issue 25, p3992 

    Investigates nanocomposite CoPt:C films as potential media for extremely high-density recording. Annealing temperature necessary to form nanocomposite CoPt:C films consisting of carbon (C) matrix and fct cobalt platinum (CoPt) nanocrystallites; Insensitivity of coercivity and grain size to film...

  • Magnetic properties enhancement of nanocomposite Nd9.5Fe81.5B9 melt-spun ribbons by La and Cr... Chang, W.C.; Wu, S.H. // Journal of Applied Physics;4/16/1997, Vol. 81 Issue 8, p4453 

    Investigates the phase transformation and magnetic properties of nanocomposite (Nd0.95La0.05)9.5(Fe1-x Crx)81.5B9, where x = 0, 0.033, 0.067 and 0.1, melt-spun ribbons. Crystallization temperature; Intrinsic coercivity; Cr concentration around grain boundaries.

  • The properties and magnetically softened grain boundaries of Nd[sub 10]Fe[sub 84-x]B[sub 6]In[sub x] (x=0,1,2) exchange coupling magnets. Ji, Q. G.; Gu, B. X.; Du, Y. W. // Journal of Applied Physics;12/15/2000, Vol. 88 Issue 12 

    The magnetic behavior of Nd[sub 10]Fe[sub 84-x]B[sub 6]In[sub x] (x=0,1,2) nanocomposites was investigated. It was found that a certain amount of indium (x=1) added to Nd[sub 10]Fe[sub 84]B[sub 6] magnets enhances the hard magnetic properties. The optimum coercivity and remanence ratio was...

  • Damping effect on resonance bounds relationship of nanostructured ferromagnets and composites. Zhou, Peiheng; Liu, Tao; Xie, Jianliang; Deng, Longjiang // Journal of Applied Physics;Jun2012, Vol. 111 Issue 11, p113912 

    In this paper, we introduce Gilbert damping parameter into the expression of resonance bounds relationship in nanomagnets to accomplish the depiction of damping effect, associated with an experimental study of ferromagnetic nanocrystalline flakes and their composites. Based on the intrinsic...

  • Fabrication of a nano-magnet on a piezo-driven tip in a TEM sample holder. Takeguchi, M.; Shimojo, M.; Che, R.; Furuya, K. // Journal of Materials Science;May2006, Vol. 41 Issue 9, p2627 

    A nanometer-sized magnet (nano-magnet) was fabricated on the tip of a tungsten needle by electron-beam-induced deposition with Fe(CO)5 gas. The needle tip, which can be moved with a stepping motor and piezo-driver, was attached inside a specially designed TEM specimen holder. This nano-magnet on...

  • Direct visualization of three-step magnetization reversal of nanopatterned spin-valve elements using off-axis electron holography. He, Kai; Smith, David J.; McCartney, Martha R. // Applied Physics Letters;4/27/2009, Vol. 94 Issue 17, p172503 

    The remanent states and magnetization reversal mechanisms for nanopatterned Co/Cu/Py (Py=Permalloy) spin-valve elements with slotted-ring shapes have been studied using off-axis electron holography. The hysteresis loops of individual elements were quantitatively determined for slots parallel to...

  • Solid containing rotationally free nanocrystalline ...-Fe...O...: Material for a nanoscale magnetic compass? Tejada, Javier; Zhang, XiXiang // Journal of Applied Physics;6/1/2000, Vol. 87 Issue 11, p8008 

    Presents a study which characterized a nanocomposite material that contains nanometer size magnets that are free to rotate in response to an applied magnetic field. Experimental procedure; Results and discussion.

  • Improving exchange-spring nanocomposite permanent magnets. Jiang, J. S.; Pearson, J. E.; Liu, Z. Y.; Kabius, B.; Trasobares, S.; Miller, D. J.; Bader, S. D.; Lee, D. R.; Haskel, D.; Srajer, G.; Liu, J. P. // Applied Physics Letters;11/29/2004, Vol. 85 Issue 22, p5293 

    We demonstrate a counterintuitive approach for improving exchange-spring magnets. Contrary to the general belief that the exchange–spring interface must be ideal and atomically coherent, we thermally process, by annealing or high-temperature deposition, epitaxial Sm–Co/Fe thin-film...


Read the Article


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

Try another library?
Sign out of this library

Other Topics