Large spontaneous exchange bias in a weak ferromagnet Pb6Ni9(TeO6)(5)

B. Koteswararao (1, 2) , Tanmoy Chakrabarty (3) , Tathamay Basu (4, 3) , Binoy Krishna Hazra (1) , P. V. Srinivasarao (5) , P. L. Paulose (3) , S. Srinath (1)

1 University of Hyderabad
2 Sri Venkateswara University
3 Tata Institute of Fundamental Research [Bangalore]
4 CRISMAT - Laboratoire de cristallographie et sciences des matériaux
5 Acharya Nagarjuna University

We report the magnetic and dielectric behavior of Pb6Ni9(TeO6)(5), a new compound comprising the honeycomb-like layers of S = 1 spins, through detailed structural, magnetic and dielectric investigation. An antiferromagnetic-type transition at 25 K (T-N) with weak-ferromagnetic behavior is revealed. Interestingly, a large value of coercive field of 1.32 T at 2 K is observed. The isothermal magnetization after zero-field-cooled condition, it exhibits the presence of large spontaneous exchange bias (SEB) with a magnitude of 0.19 T at 2 K; which is rare in single bulk materials, especially without external doping. The value of |H-EB| further enhances to 0.24 T under 16 T field-cooled condition, confirming the presence of large exchange bias in the material.

Mots clés: Electronic properties and materials; Magnetic properties and materials

Domaines: Chimie; Cristallographie; Matériaux; Chimie théorique et/ou physique

B. Koteswararao, Tanmoy Chakrabarty, Tathamay Basu, Binoy Krishna Hazra, P. V. Srinivasarao, et al.. Large spontaneous exchange bias in a weak ferromagnet Pb6Ni9(TeO6)(5). Scientific Reports, 2017, 7, pp.25-31. ⟨10.1038/s41598-017-09056-w⟩. ⟨hal-02175407⟩