采用密度泛函理论研究了空位和反位缺陷效应对四元Heusler合金CoFeTiSb电子结构的影响.结果表明,VdCo、VdFe空位缺陷和Tisb反位缺陷具有负的形成能,能保持85%以上的自旋极化率,在CoFeTiSb合金工业制备过程中自发形成几率较大;VdTi、VdSo空位缺陷和FeCo反位缺陷虽然费米面处自旋极化率为100%,仍保持半金属性,但正的形成能表明在制备过程中它们出现的几率较小.此外,SbCo、SbFe、SbTi、CoTi、FeTi反位缺陷由于具有较大的形成能和半金属性破坏,自旋极化率不同程度降低.
参考文献
[1] | Bothina Hamad;Qing-Miao Hu.The effect of defects on the electronic and magnetic properties of Fe_2MnSi Heusler alloy[J].Physica status solidi, B. Basic research,201112(12):2893-2898. |
[2] | N.T. Mahmoud;J.M. Khalifeh;B.A. Hamad.The effect of defects on the electronic and magnetic properties of the Co_2VSn full Heusler alloy: Ab-initio calculations[J].Intermetallics,2013:33-37. |
[3] | Saadi Berri;D. Maouche;M. Ibrir;F. Zerarga.A first-principle study of half-metallic ferrimagnetism in the CoFeTiSb quaternary Heusler compound[J].Journal of Magnetism and Magnetic Materials,2014:65-69. |
[4] | 张远强;冯雨;高钦翔;黄海深.LiMgPbSb型四元Heusler合金CoFeTiSb的半金属性及其无序效应[J].原子与分子物理学报,2015(1):158-162. |
[5] | Skaftouros, S.;?zdo?an, K.;?a?io?lu, E.;Galanakis, I..Generalized Slater-Pauling rule for the inverse Heusler compounds[J].Physical review, B. Condensed matter and materials physics,20132(2):024420-1-024420-7. |
[6] | Ravel B.;Cross JO.;Raphael MP.;Harris VG.;Ramesh R.;Saraf V..Atomic disorder in Heusler Co2MnGe measured by anomalous x-ray diffraction[J].Applied physics letters,200215(15):2812-2814. |
[7] | Segall MD.;Lindan PJD.;Probert MJ.;Pickard CJ.;Hasnip PJ.;Clark SJ. Payne MC..First-principles simulation: ideas, illustrations and the CASTEP code[J].Journal of Physics. Condensed Matter,200211(11):2717-2744. |
[8] | Lun Xiong;Lin Yia;G.Y. Gao.Search for half-metallic magnets with large half-metallic gaps in the quaternary Heusler alloys CoFeTiZ and CoFeVZ (Z=Al, Ga, Si, Ge, As, Sb)[J].Journal of Magnetism and Magnetic Materials,2014:98-103. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%