Absence of ferromagnetism in Mn-doped tetragonal zirconia

作者：Srivastava S K^*; Lejay P; Barbara B; Boisron O; Pailhes S; Bouzerar G

来源：Journal of Applied Physics, 2011, 110(4): 043929.

DOI：10.1063/1.3626788

In a recent letter, it has been predicted within first principle studies that Mn-doped ZrO(2) compounds could be good candidates for spintronics application because expected to exhibit ferromagnetism far beyond room temperature. Our purpose is to address this issue experimentally for Mn-doped tetragonal zirconia. We have prepared polycrystalline samples of Y(0.15)(Zr(0.85-y)Mn(y))O(2) (y = 0, 0.05, 0.10, 0.15, 0.20) by using standard solid state method at equilibrium. The obtained samples were carefully characterized by using x-ray diffraction, scanning electron microscopy, elemental color mapping, x-ray photoemission spectroscopy, and magnetization measurements. From the detailed structural analyses, we have observed that the 5% Mn doped compound crystallized into two symmetries (dominating tetragonal and monoclinic), whereas higher Mn doped compounds are found to be in the tetragonal symmetry only. The spectral splitting of the Mn 3s core-level x-ray photoelectron spectra confirms that Mn ions are in the Mn(3+) oxidation state and indicate a local magnetic moment of about 4.5 mu(B)/Mn. Magnetic measurements showed that compounds up to 10% of Mn doping are paramagnetic with antiferromagnetic interactions. However, higher Mn doped compound exhibits local ferrimagnetic ordering. Thus, no ferromagnetism has been observed for all Mn-doped tetragonal ZrO(2) samples.

• 出版日期2011-8-15
• 单位中国地震局