Local co structure and ferromagnetism in ion-implanted Co-doped LiNbO3

被引：43

作者：

Song, C.

Zeng, F.

Shen, Y. X.

Geng, K. W.

Xie, Y. N.

Wu, Z. Y.

Pan, F. ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Mat Sci & Engn, Adv Mat Lab, Beijing 100084, Peoples R China

[2] Chinese Acad Sci, Beijing Synchrotron Radiat Facil, Beijing 100039, Peoples R China

来源：

PHYSICAL REVIEW B | 2006年 / 73卷 / 17期

关键词：

D O I：

10.1103/PhysRevB.73.172412

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A ferromagnetic oxide Co-0.05(LiNb)(0.95)O3-delta was prepared by Co ion implantation into (104) LiNbO3 wafers. Co is uniformly distributed to a depth of similar to 220 nm by implanting at three different energies and doses. Electron energy loss spectroscopy and x-ray absorption near-edge structure (XANES) spectra reveal a solid solution of cobalt in an implanted layer, where Co is not metallic but in the 2+ state. Furthermore, full multiple-scattering ab initio calculations of Co XANES at the K edge clearly provide a structure fingerprint to determine Co substitution at Li lattice sites rather than Nb. The Co-0.05(LiNb)(0.95)O3-delta system exhibits room temperature ferromagnetism of 1.3 mu(B)/Co ion with an easy in-plane axis and a high Curie temperature of 710 K.

引用

页数：4

共 28 条

[1] Real-space multiple-scattering calculation and interpretation of x-ray-absorption near-edge structure [J].