锰/铁离子注入钇铁石榴石（YIG）中居里温度的局部升高

Local increase of the Curie temperature in Mn/Fe implanted YFeO (YIG).

作者信息

Krastev P B, Gunnlaugsson H P, Nomura K, Bharuth-Ram K, Qi B, Masenda H, Mølholt T E, Naidoo D, Ólafsson S, Martín-Luengo A Tarazaga, Unzueta I, Johnston K, Schell J, Gislason H P

机构信息

Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee Boulevard, Sofia, 1784, Bulgaria.

Science Institute, University of Iceland, Dunhaga 3, IS-107, Reykjavík, Iceland.

出版信息

Appl Radiat Isot. 2020 Jun;160:109121. doi: 10.1016/j.apradiso.2020.109121. Epub 2020 Mar 4.

DOI:10.1016/j.apradiso.2020.109121

PMID:32174465

Abstract

The change in the Curie temperature of single crystalline garnet YFeO (YIG) sample due to lattice damage induced by ion implantation has been investigated in Fe emission Mössbauer Spectroscopy (eMS) following implantation of Mn (T = 1.5 min). The Mössbauer spectra analysis reveal high spin Fe ions substituted on both the octahedral and the tetrahedral sites. Measurements in the temperature range 298 K-798 K show that average values of the magnetic hyperfine field are decreased by the implantation-induced damage on the local lattice structure of the YIG. The Curie temperature, however, is determined to be 651 ± 5 K, considerably higher than the value of bulk YIG (559 K). This is most likely due to lattice damage-induced changes on the spin configurations of YIG through a Fe-O-Fe distortion scheme.

摘要

在对锰（T = 1.5分钟）进行离子注入后，通过铁发射穆斯堡尔光谱（eMS）研究了离子注入引起的晶格损伤导致的单晶石榴石YFeO（YIG）样品居里温度的变化。穆斯堡尔光谱分析表明，高自旋铁离子取代了八面体和四面体位置。在298 K - 798 K温度范围内的测量结果表明，注入引起的损伤降低了YIG局部晶格结构上的磁超精细场平均值。然而，居里温度被确定为651 ± 5 K，远高于块状YIG的值（559 K）。这很可能是由于晶格损伤通过Fe - O - Fe畸变方案引起了YIG自旋构型的变化。