arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0810.4104cond-mat.str-el
收藏

外延La0.7Sr 0.3MnO 3薄膜的磁圆二色谱研究

Magnetic Circular Dichroism spectroscopy in epitaxial La0.7Sr0.3MnO3 thin films

T. K. Nath, J. R. Neal, G. A. Gehring

备注：
12 pages of text and figures. This paper will appear in the proceedings of MMM published in Journal of Applied Physics and will be presented in a talk at MMM CF-05
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

磁光测量是研究导带极化随温度变化的一种非常有效的工具。本文用磁光测量研究了在单晶（001）LaAlO_3（LAO）和（001）晶格匹配衬底（LSAT）上外延生长的50 nm LSMO（x=0.3）应变薄膜中可动电子的极化。在磁场高达0.5 T和温度范围（10 ~ 450 K）内研究了磁性圆二色性（MCD）。两种薄膜的MCD谱均在带隙约3eV处出现一个峰，且随着温度的升高，峰向低能侧移动。随着温度的升高，所有这些金属膜中在较低能量（约1.8 eV）处出现单独的极化子峰（在绝缘样品中众所周知）。在LAO上的膜中导带极化的快速降低对于这些锰氧化物在室温自旋电子学中的使用具有强烈的影响。

英文摘要：

Magneto optic measurements are a very powerful tool for investigating the polarization of a conduction band as a function of temperature and are used here to study the polarization of the mobile electrons in 50nm LSMO (x=0.3) strained thin films grown epitaxially on single crystalline (001) LaAlO3 (LAO) and (001) lattice matched substrate (LSAT). The magnetic circular dichroism (MCD) has been investigated in magnetic fields up to 0.5 T and over a temperature range (10 to 450 K). The MCD spectra of both the films show a peak at the band gap at around 3 eV and the peak is found to be shifted towards lower energy side with the increase of temperature. A separate polaron peak (well known in insulating samples) appears at lower energy (about 1.8 eV) with the increase of temperature in all these metallic films. The rapid decrease in conduction band polarization in the film on LAO has strong implications for the use of these manganites in room temperature spintronics.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑