Magnetism in Co-doped rutile TiO2 nanoparticles

✍ Scribed by B.Z. Jiang; T.L. Phan; D.S. Yang; K.W. Lee; S.C. Yu

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 743 KB
• Volume: 150
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/j.ssc.2010.07.025

✦ Synopsis

We studied the magnetic properties of x at.% Co-doped rutile TiO 2 nanoparticles (with x = 1.0, 3.0, 5.0) synthesized by the sol-gel technique. The obtained experimental results revealed that all the samples exhibited the ferromagnetic behavior at room temperature. The ferromagnetic order increased with increasing the Co content, whereas the coercivity force H c decreased. The zero-field-cooled and fieldcooled magnetizations versus temperature showed a peak at about 40 K, which was assigned to be from an antiferromagnetic phase CoTiO 3 . The presence of this phase was also confirmed by X-ray diffraction patterns for the 3.0 and 5.0 at.% Co-doped samples. By means of X-ray absorption fine structure study, we suggested that the room-temperature ferromagnetism in Co-doped TiO 2 nanoparticles was generated from Co 2+ ions present in the TiO 2 host lattice.