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Magnetic Properties of La1-xSrxMnO3 Nanocrystals Embedded in A Mesoporous Silicate

Published online by Cambridge University Press:  15 February 2011

Shigemi Kohiki ,
Yoshihisa Ishida ,
Sinichiro Nogami ,
Hirokazu Shimooka ,
Takayuki Tajiri ,
Hiroyuki Deguchi ,
Masanori Mitome  and
Masaoki Oku
Shigemi Kohiki
Affiliation:
Faculty of Engineering, Kyusyu Institute of Technology, Tobata, Kita-kyusyu 804-8550, Japan
Yoshihisa Ishida
Affiliation:
Faculty of Engineering, Kyusyu Institute of Technology, Tobata, Kita-kyusyu 804-8550, Japan
Sinichiro Nogami
Affiliation:
Faculty of Engineering, Kyusyu Institute of Technology, Tobata, Kita-kyusyu 804-8550, Japan
Hirokazu Shimooka
Affiliation:
Faculty of Engineering, Kyusyu Institute of Technology, Tobata, Kita-kyusyu 804-8550, Japan
Takayuki Tajiri
Affiliation:
Faculty of Engineering, Kyusyu Institute of Technology, Tobata, Kita-kyusyu 804-8550, Japan
Hiroyuki Deguchi
Affiliation:
Faculty of Engineering, Kyusyu Institute of Technology, Tobata, Kita-kyusyu 804-8550, Japan
Masanori Mitome
Affiliation:
Advanced Materials Laboratory, National Institute of Materials Science, Tsukuba, Ibaraki 305-0044, Japan
Masaoki Oku
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
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Abstract

We have prepared the diluted assemblies of La1-xSrxMnO3 (x = 0, 0.05, 0.15 and 0.175) nanocrystals (ø ∼ 2∼3 nm) embedded in amorphous SiO2 to clarify the nano-magnetism of both the antiferromagnetic and ferromagnetic La1-xSrxMnO3. All the samples of x = 0, 0.05, 0.15, and 0.175 exhibited superparamagnetism with the blocking temperature of ∼40 K. Except the hump at ∼40 K, the antiferromagnetic x = 0 and 0.05 samples showed simply paramagnetic-like characteristics in both the temperature dependent dc and ac susceptibilities. The ferromagnetic x = 0.15 and 0.175 samples demonstrated complicated characteristics in the temperature dependent susceptibilities. The samples indicated antiferromagnetic and ferromagnetic behavior above ∼50 K and ∼100 K, respectively. The field dependent magnetization is consistent with the predictions of systems having randomly oriented and noninteracting fine particles (ø ∼2∼3 nm). For the ferromagnetic La1-xSrxMnO3 nanocrystals, the antiferromagnetism at crystal surfaces suppressed largely the ferromagnetism in bulk.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 776: Symposium Q – Unconventional Approaches to Nanostructures with Applications in Electronics, Photonics, Information Storage and Sensing , 2003 , Q11.14
Copyright
Copyright © Materials Research Society 2003

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