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Journal of Applied Physics / Volume 111 / Issue 7 / PROCEEDINGS OF THE 56TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS / Soft Magnetic Materials

J. Appl. Phys. 111, 07A301 (2012); http://dx.doi.org/10.1063/1.3670056 (3 pages)

Effect of P addition on nanocrystallization and high temperature magnetic properties of low B and Nb containing FeCo nanocomposites

Rajat K. Roy1,2, S. Shen2, S. J. Kernion2, and M. E. McHenry2

1NDE and Magnetic Materials Group, CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India
2Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA

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(Received 10 September 2011; accepted 4 October 2011; published online 6 February 2012)

The P content dependencies of the nanocrystallization behaviors and high temperature magnetic properties of the Fe54.6Co29.4Si2.8(B0.8−YPY)14Nb1Cu1 (Y = 0, 0.2, and 0.3) alloys have been investigated. Alloys were prepared by melt spinning and subsequently annealed in an argon atmosphere to induce nanocrystallization. P addition increases primary crystallization temperature (Tx1), thermal stability (ΔTx), and activation energy (QJMA) for secondary crystallization in as-cast alloys. The saturation induction (Bs) of 1.68 T for as-cast P free alloy decreases continuously with the addition of P. However, the soft magnetic properties are enhanced for P added alloys. The XRD pattern reveals that grain refinement increases with increasing P contents. Alloys annealed at 430 °C confirm primary nanocrystallization of α-FeCo in the amorphous matrix, while annealing at 550 °C causes secondary crystallization of other non-magnetic phases as well. The magnetic moment of as-cast and annealed alloys, measured by vibrating sample magnetometry (VSM), has minimum values at two temperatures, labeled Tc1, Tc2, prior to secondary crystallization, corresponding to the ferromagnetic transitions of as-quenched amorphous and residual amorphous phase, respectively. The stabilization of amorphous phase delays primary crystallization, resulting in increase of Tc1 for P-rich as-cast alloys.

© 2012 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL DETAILS
  3. RESULTS AND DISCUSSION
  4. CONCLUSIONS

KEYWORDS, PACS, and IPC

Keywords

amorphous magnetic materials, annealing, boron alloys, cobalt alloys, copper alloys, crystallisation, ferromagnetic materials, grain refinement, high-temperature effects, iron alloys, magnetic moments, magnetic transitions, melt spinning, nanocomposites, nanofabrication, nanomagnetics, niobium alloys, phosphorus alloys, quenching (thermal), silicon alloys, soft magnetic materials, thermal stability, X-ray diffraction

PACS

  • 75.75.Cd

    Fabrication of magnetic nanostructures

  • 81.40.Gh

    Other heat and thermomechanical treatments

  • 75.30.Cr

    Saturation moments and magnetic susceptibilities

  • 75.50.Kj

    Amorphous and quasicrystalline magnetic materials

  • 75.50.Bb

    Fe and its alloys

  • 75.30.Kz

    Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

International Patent Classification (IPC)

  • C22C38/00

    Ferrous alloys, e.g. steel alloys

  • B01D9/00

    Crystallisation

  • B82B1/00

    Nano-structures

  • B82B3/00

    Manufacture or treatment of nano-structures

  • C21D1/26

    Methods of annealing

  • C21D1/62

    Quenching devices

  • C22C9/00

    Alloys based on copper

  • C22C19/00

    Alloys based on nickel or cobalt

  • H01F1/00

    Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties

  • H01F1/12

    Of soft-magnetic materials

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3670056

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    J. Long, M. E. McHenry, D. Urciuoli, V. Keylin, J. Huth, and T. Salem, J. Appl. Phys. 103, 07E705 (2008)JAPIAU00010300000707E705000001.

    A. Makino, H. Men, K. Yubuta, and T. Kubota, J Appl. Phys. 105, 013922 (2009)JAPIAU000105000001013922000001.

    M. A. Willard, D. E. Laughlin, M. E. McHenry, D. Thoma, K. Sickafus, J. O. Cross, and V. G. Harris, J. Appl. Phys. 84, 6773 (1998)JAPIAU000084000012006773000001.

    K. J. Miller, A. Leary, S. J. Kernion, A. Wise, D. E. Laughlin, M. E. McHenry, V. Keylin, and Joe Huth, J Appl. Phys. 107, 09A316 (2010)JAPIAU00010700000909A316000001.

    C.-Y. Um, F. Johnson, M. Simone, J. Barrow, and M. E. McHenry, J. Appl. Phys. 97, 10F504 (2005)JAPIAU00009700001010F504000001.


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