Investigation of Ni@CoO core-shell nanoparticle films synthesized by sequential layer deposition

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• 作者：M.C. Spadaro^a ; ^b ; ^{mariachiara.spadaro@unimore.it} ; P. Luches^b ; F. Benedetti^a ; ^b ; S. Valeri^a ; ^b ; S. Turchini^c ; G. Bertoni^d ; A.M. Ferretti^e ; E. Capetti^e ; A. Ponti^e ; S. D&rsquo ; Addato^a ; ^b ;
• 关键词：Ni ; CoO ; Core-shell nanoparticles ; Electron microscopy ; X-ray photoelectron spectroscopy ; X-ray magnetic circular dichroism
• 刊名：Applied Surface Science
• 出版年：2017
• 出版时间：28 February 2017
• 年：2017
• 卷：396
• 期：Complete
• 页码：1860-1865
• 全文大小：1309 K
• 卷排序：396

文摘

We studied Ni/CoO core-shell nanoparticles (NP) obtained with a gas aggregation source. The NP oxide shells were produced bye reactive deposition of Co in Oxygen atmosphere (pO2 ≈ 10−7 mbar). XPS, SEM, STEM were used to obtain information on Ni chemical state and NP structure and morphology. XMCD result showed evidence of remanent magnetization at room temperature. We interpret XMCD results as due to stabilization induced by exchange bias due to AFM/FM coupling at the core/shell interface.