磁性材料磁有序的分子場來源
發(fā)布時間:2018-06-26 05:36
本文選題:磁有序模型 + 磁性氧化物; 參考:《物理學(xué)報》2017年06期
【摘要】:對于磁性材料磁有序能的來源,即外斯分子場來源,本文提出一個模型:在磁性金屬和合金中的相鄰離子實(shí)之間,以及磁性氧化物的相鄰陰陽離子間,其外層軌道上高速運(yùn)動的電子分別有一定概率形成三種不同的狀態(tài).1)具有一定壽命的自旋相反的電子對,稱為外斯電子對(WEP);2)距離很近且自旋方向相同的電子,容易發(fā)生互相交換,交換前后電子的自旋方向保持不變;3)當(dāng)一個離子外層軌道有2個電子,其相鄰的離子外層軌道只有1個電子時,前者多出的電子可以躍遷到后者的軌道上,并且保持自旋方向不變.我們認(rèn)為,WEP兩個電子間的靜磁吸引能是分子場(即磁有序能)的主要來源.進(jìn)而,推導(dǎo)出WEP的能量表達(dá)式、兩電子的平衡間距和最大間距,探討了在幾種鈣鈦礦結(jié)構(gòu)錳氧化物中形成外斯電子對的概率,用以解釋居里溫度附近晶格常數(shù)隨溫度變化的特點(diǎn).結(jié)果表明這個模型是合理的.
[Abstract]:For the source of magnetic ordering energy of magnetic materials, I. e., the source of Wise molecular field, a model is proposed: between adjacent ions in magnetic metals and alloys, and between adjacent anions and anions of magnetic oxides. The electrons moving at high speed in its outer orbit have a certain probability of forming three different states (.1) two pairs of spin opposite electrons with a certain lifetime, called WEP (WEP) 2) which are very close and have the same spin direction. The spin direction of the electrons before and after the exchange remains invariant.) when there are two electrons in an ion outer orbit and only one electron in its adjacent ion outer orbit, the electrons extra from the former can be transferred to the latter orbit. And keep the spin direction unchanged. We consider that the magnetostatic attraction energy between the two electrons of WEP is the main source of the molecular field (that is, the magnetic ordering energy). Furthermore, the energy expression of WEP, the equilibrium distance between two electrons and the maximum spacing are derived, and the probability of forming Weses electron pair in several kinds of perovskite manganese oxides is discussed. It is used to explain the variation of lattice constant with temperature near Curie temperature. The results show that the model is reasonable.
【作者單位】: 河北師范大學(xué)物理科學(xué)與信息工程學(xué)院河北省新型薄膜材料實(shí)驗(yàn)室;中國科學(xué)院物理研究所磁學(xué)國家重點(diǎn)實(shí)驗(yàn)室;
【基金】:國家自然科學(xué)基金(批準(zhǔn)號:11174069) 河北省自然科學(xué)基金(批準(zhǔn)號:A2015205111) 河北省應(yīng)用基礎(chǔ)研究計劃重點(diǎn)基礎(chǔ)研究項(xiàng)目(批準(zhǔn)號:16961106D) 河北省教育廳青年基金(批準(zhǔn)號:QN2016015)資助的課題~~
【分類號】:TM271
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