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磁场退火下Co掺杂SnO₂薄膜晶体各向异性的改变及磁矩的增强

Modification of crystal anisotropy and enhancement of magnetic moment of Co-doped SnO2 thin films annealed under magnetic field.

作者信息

Loya-Mancilla Sagrario M, Poddar Pankaj, Das Raja, Ponce Hilda E Esparza, Templeton-Olivares Ivan L, Solis-Canto Oscar O, Ornelas-Gutierrez Carlos E, Espinosa-Magaña Francisco, Olive-Méndez Sion F

机构信息

Centro de Investigación en Materiales Avanzados, S.C., Cimav, Av. Miguel de Cervantes 120, Complejo Industrial Chihuahua, C.P. 31109 Chihuahua, Chihuahua, Mexico.

Physical and Materials Chemistry Division, National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India.

出版信息

Nanoscale Res Lett. 2014 Nov 25;9(1):635. doi: 10.1186/1556-276X-9-635. eCollection 2014.

DOI:10.1186/1556-276X-9-635
PMID:25489286
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4256971/
Abstract

Co-doped SnO2 thin films were grown by sputtering technique on SiO2/Si(001) substrates at room temperature, and then, thermal treatments with and without an applied magnetic field (HTT) were performed in vacuum at 600°C for 20 min. HTT was applied parallel and perpendicular to the substrate surface. Magnetic M(H) measurements reveal the coexistence of a strong antiferromagnetic (AFM) signal and a ferromagnetic (FM) component. The AFM component has a Néel temperature higher than room temperature, the spin axis lies parallel to the substrate surface, and the highest magnetic moment m =7 μB/Co at. is obtained when HTT is applied parallel to the substrate surface. Our results show an enhancement of FM moment per Co(+2) from 0.06 to 0.42 μB/Co at. for the sample on which HTT was applied perpendicular to the surface. The FM order is attributed to the coupling of Co(+2) ions through electrons trapped at the site of oxygen vacancies, as described by the bound magnetic polaron model. Our results suggest that FM order is aligned along [101] direction of Co-doped SnO2 nanocrystals, which is proposed to be the easy magnetization axis.

摘要

通过溅射技术在室温下于SiO₂/Si(001)衬底上生长共掺杂的SnO₂薄膜，然后在真空中600°C下进行20分钟的有外加磁场和无外加磁场的热处理（HTT）。HTT分别平行和垂直于衬底表面施加。磁性M(H)测量揭示了强反铁磁（AFM）信号和铁磁（FM）成分的共存。AFM成分具有高于室温的奈尔温度，自旋轴平行于衬底表面，当HTT平行于衬底表面施加时，获得最高磁矩m = 7 μB/Co原子。我们的结果表明，对于HTT垂直于表面施加的样品，每个Co(+2)的FM磁矩从0.06增强到0.42 μB/Co原子。如束缚磁极化子模型所述，FM序归因于通过捕获在氧空位位置的电子实现的Co(+2)离子耦合。我们的结果表明，FM序沿着共掺杂SnO₂纳米晶体的[101]方向排列，该方向被认为是易磁化轴。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8049/4256971/1cd47f3b8715/1556-276X-9-635-6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8049/4256971/5f45d681c208/1556-276X-9-635-1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8049/4256971/c0b835042438/1556-276X-9-635-2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8049/4256971/084c46924ecf/1556-276X-9-635-3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8049/4256971/2981efb1fbb5/1556-276X-9-635-4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8049/4256971/ae6efc3a42f3/1556-276X-9-635-5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8049/4256971/1cd47f3b8715/1556-276X-9-635-6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8049/4256971/5f45d681c208/1556-276X-9-635-1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8049/4256971/c0b835042438/1556-276X-9-635-2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8049/4256971/084c46924ecf/1556-276X-9-635-3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8049/4256971/2981efb1fbb5/1556-276X-9-635-4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8049/4256971/ae6efc3a42f3/1556-276X-9-635-5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8049/4256971/1cd47f3b8715/1556-276X-9-635-6.jpg

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本文引用的文献

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