Magnetic phase transitions in Gd64Sc36 studied using non-contact ultrasonics

Article, Preprint English OPEN
Trushkevych, Oksana ; Fan, Yichao ; Perry, Robert ; Edwards, Rachel S. (2012)
  • Publisher: IOP PUBLISHING LTD
  • Journal: JOURNAL OF PHYSICS D-APPLIED PHYSICS (issn: 0022-3727)
  • Related identifiers: doi: 10.1088/0022-3727/46/10/105005
  • Subject: QC | Condensed Matter - Other Condensed Matter | Condensed Matter - Materials Science

The speed and attenuation of ultrasound propagation can be used to determine material properties and identify phase transitions. Standard ultrasonic contact techniques are not always convenient due to the necessity of using couplant, however, recently reliable non-contact ultrasonic techniques involving electromagnetic generation and detection of ultrasound with electromagnetic acoustic transducers (EMATs) have been developed for use on electrically conducting and/or magnetic materials. We present a detailed study of magnetic phase transitions in a single crystal sample of Gd64Sc36 magnetic alloy using contact and non-contact ultrasonic techniques for two orientations of external magnetic field. Phase diagrams are constructed based on measurements of elastic constant, the attenuation, and the efficiency of generation when using an EMAT. The EMATs are shown to provide additional information related to the magnetic phase transitions in the studied sample, and results identify a conical helix phase in Gd64Sc36 in the magnetic field orientation H||c.
  • References (25)
    25 references, page 1 of 3

    [1] Hughes I D, Dane M, Ernst A, Hergert W, Luders M, Poulter J, Staunton J B, Svane A, Szotek Z and Temmerman W M 2007 Lanthanide contraction and magnetism in the heavy rare earth elements Nature 446 650-3

    [2] Elliott J F 1959 Thermomagnetic generator J. Appl. Phys. 30 1774-7

    [3] Hsu C-J, Sandoval S M, Wetzlar K P and Carman G P 2011 Thermomagnetic conversion efficiencies for ferromagnetic materials J. Appl. Phys. 110 123923

    [4] Sandeman K G 2012 Magnetocaloric materials: the search for new systems Scr. Mater. 67 566

    [5] Melville R J, Bates S, Sousa J B and Palmer S B 1988 The magnetic structure of Gd-Sc alloys Europhys. Lett. 6 725

    [6] Salgueiro da Silva M, Moreira J M, Mendes J A, de Abreu C S, Amaral V S, Sousa J B, Melville R J and Palmer S B 1995 The magnetic properties of a Gd72Sc28 single crystal J. Phys.: Condens. Matter 7 9853

    [7] Salgueiro da Silva M, Moreira J M, Pereira de Azevedo M M, Mendes J A, de Abreu C S, Sousa J B, Melville R J and Palmer S B 1999 Helimagnetism and field-induced phases in random Gd64 Sc36 single crystals J. Phys.: Condens. Matter 11 7115-24

    [8] Lu¨thi B 2005 Physical Acoustics in the Solid Phase (Berlin: Springer)

    [9] Kinsler L E and Frey A R 1962 Physical Acoustics in the Solid Phase (New York: Wiley)

    [10] Thompson R B 1978 A model for the electromagnetic generation of ultrasonic guided waves in ferromagnetic metal polycrystals IEEE Trans. Sonics Ultrason. 25 7-15

  • Metrics
    No metrics available
Share - Bookmark