Abstract
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 (TN) 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 |HEB| further enhances to 0.24 T under 16 T field-cooled condition, confirming the presence of large exchange bias in the material.
Highlights
IntroductionAs there is no requirement of external H for generating the unidirectional anisotropy, the spontaneous exchange bias (SEB) effect will have greater applications in the electric field controlled exchange bias (EB) devices
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
Conventional exchange bias (CEB) effect is a magnetic phenomenon observed by a shift along the magnetization and magnetic field axis in the magnetic hysteresis loop when the material is cooled in a magnetic field (H)[1, 2]
Summary
As there is no requirement of external H for generating the unidirectional anisotropy, the SEB effect will have greater applications in the electric field controlled exchange bias (EB) devices This unusual zero-field-cooled (ZFC) EB or large SEB has been observed in a few systems; BiFeO3-Bi2Fe4O9 nanocomposite, NiMnIn13, Mn2PtGa, La1.5Sr0.5MnCoO6, and Co0.75Cu0.25Cr2O4 polycrystalline samples[7,8,9,10,11,12]. A large value of coercive field about 1.32 T and SEB field of about 0.19 T at 2 K are observed when the sample is cooled under ZFC condition The value of such high SEB is rare, especially in single bulk material without any external doping. There is no previous report of magnetic and dielectric behavior of this interesting compound
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