Details

Autor(en) / Beteiligte

• Wu, Linjie
• Zhang, Yongjia
• Nie, Zhongquan
• Cao, Ensi

Titel

Intrinsic Complex Vacancy-Induced d0 Magnetism in Ca2Nb2O7 PLD Film

Ist Teil von

• Frontiers in materials, 2021-08, Vol.8

Ort / Verlag

Frontiers Media S.A

Erscheinungsjahr

2021

Link zum Volltext

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• Introducing magnetism into the ferroelectric Ca 2 Nb 2 O 7 with high Curie temperature can make it a potential multiferroic material at room temperature. Stoichiometric Ca 2 Nb 2 O 7 , nonstoichiometric Ca 1.9 Nb 2 O 7-δ and Ca 2 Nb 1.9 O 7-δ single phase films were deposited on STO (110) substrate by pulsed laser deposition under appropriate conditions. The films were characterized by XRD, FE-SEM, Element mapping and XPS. Both stoichiometric Ca 2 Nb 2 O 7 and Ca 1.9 Nb 2 O 7-δ films were diamagnetic in the magnetic measurement and ab initio calculations, while the Ca 2 Nb 1.9 O 7-δ film with the complex vacancy of V Nb+O exhibited ferromagnetic behavior at room temperature, with the saturated magnetization of 3.6 emu/cm 3 . Calculations on the Ca 2 Nb 2 O 7 (010) surface indicate that the V Nb+O can induce spin polarization on the residual O atoms around the Nb vacancies, and the system was most stable when the Nb and O vacancies were the 4 th nearest-neighbored, with FM coupling energetically more stable than the AFM coupling. Our work verified experimentally and theoretically the feasibility of introducing ferromagnetism into Ca 2 Nb 2 O 7 film by the intrinsic complex vacancy of V Nb+O .