Magnetic anisotropy and phase transitions in single-crystal Tb5(Si2 2Ge1 8)

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Han, M. ; Snyder, John Evan ; Tang, W. ; Lograsso, T. A. ; Schlagel, D. ; Jiles, David

The Tb5(SixGe4−x) alloy system has many features in common with the Gd5(SixGe4−x) system although it has a more complex magnetic and structural phase diagram. This paper reports on the magnetic anisotropy and magnetic phase transition of single-crystal Tb5(Si2.2Ge1.8) which has been investigated by the measurements of M-H and M-T along the a, b, and c axes. The variation of 1/χ vs T indicates that there is a transition from paramagnetic to ferromagnetic at Tc = 110 K. Below this transition temperature M-H curves show very strong anisotropy, and it is believed that this is due to the complex spin configuration. M-H measurements at T = 110 K show that the a axis is the easy axis, and that the saturation magnetization is 200 emu/g. The b axis is the hard axis, which needs an external magnetic field much higher than 2 T to saturate the magnetization in that direction, indicating a high magnetocrystalline anisotropy. The c axis is of intermediate hardness. The magnetic properties of this material are therefore very different from those of the related Gd5Si2Ge2 system, in which the b axis was found to be the easy axis and the magnitude of the anisotropy was smaller.
  • References (16)
    16 references, page 1 of 2

    1K. A. Gschneidner, Jr., V. K. Pecharsky, A. O. Pecharsky, V. V. Ivtchenko, and E. M. Levin, J. Alloys Compd. 303-304, 214 s2000d.

    2V. K. Pecharsky and K. A. Gschneidner, Jr., Phys. Rev. Lett. 78, 4494 s1997d.

    3L. Morellon, J. Stankiewicz, B. Garcia-Landa, P. A. Algarabel, and M. R.

    Ibarra, Appl. Phys. Lett. 73, 3462 s1998d.

    4V. K. Pecharsky and K. A. Gschneidner, Jr., Adv. Mater. sWeinheim, Ger.d 13, 683 s2001d.

    5L. Morellon, C. Magen, P. A. Algarabel, M. R. Ibarra, and C. Ritter, Appl.

    Phys. Lett. 79, 1318 s2001d.

    6L. Morellon, C. Ritter, C. Magen, P. A. Algarabel, and M. R. Ibarra, Phys.

    Rev. B 68, 024417 s2003d.

    7N. P. Thuy, N. V. Nong, N. T. Hien, L. T. Tai, T. Q. Vinh, P. D. Thang, and E. Bruck, J. Magn. Magn. Mater. 242, 841 s2002d.

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