CAJ | 학술논문

通过X射线吸收近边结构（XANES ）、超导量子干涉仪和第一性原理计算研究了脉冲激光沉积法（PLD）制备的Ni1- x Mnx O （0.01≤x≤0.05）薄膜的微观结构和磁学性质．X射线吸收近边结构表明，当x≤0.03时，掺杂的M n替代了NiO晶格中的Ni原子，并且以混合价态（＋2/＋3）的形式存在．当x＞0.03时，掺杂的部分Mn离子形成了类Mn2 O3杂相．磁性测量表明，随着Mn含量从0.01增加到0.03， Ni1- x Mnx O薄膜的饱和磁矩从0.3μB/Mn增加到了0.45μB/Mn ．基于第一性原理计算，我们提出Mn3＋离子之间通过Ni空位表现出了铁磁性耦合，M n2＋离子之间则通过超交换作用表现出了反铁磁耦合．
통과X사선흡수근변결구（XANES ）、초도양자간섭의화제일성원리계산연구료맥충격광침적법（PLD）제비적Ni1- x Mnx O （0.01≤x≤0.05）박막적미관결구화자학성질．X사선흡수근변결구표명，당x≤0.03시，참잡적M n체대료NiO정격중적Ni원자，병차이혼합개태（＋2/＋3）적형식존재．당x＞0.03시，참잡적부분Mn리자형성료류Mn2 O3잡상．자성측량표명，수착Mn함량종0.01증가도0.03， Ni1- x Mnx O박막적포화자구종0.3μB/Mn증가도료0.45μB/Mn ．기우제일성원리계산，아문제출Mn3＋리자지간통과Ni공위표현출료철자성우합，M n2＋리자지간칙통과초교환작용표현출료반철자우합．
The microstructural and magnetic properties of Ni1 - xMnxO (0.01≤ x≤0.05) thin films prepared by pulsed laser deposition (PLD ) were studied by combining X-ray absorption near edge structure (XANES ) spectroscopy , superconducting quantum interference device (SQUID ) and first-principles calculations .XANES results at Mn K-edge show that at the low Mn doping level of x≤0.03 ,the Mn ions in the mixed oxidation valence state (+2/+3) are incorporated substitutionally into the NiO host ,while at higher doping level of x > 0.03 Mn2O3-like impurity phase is formed .Magnetization measurements indicate that the saturation magnetic moment of Ni1 - xMnxO film increases from 0.3 to 0.45 μB/Mn as the Mn content rises from 0.01 to 0.03 .It is proposed that interactions between Mn3+ ions mediated by Ni vacancies exhibit ferromagnetic coupling ,while interactions between Mn2+ ions exhibit antiferromagnetic coupling through superexchange interaction .