青岛科技大学主页平台管理系统 chenkezheng--Home-- New insight in hard magnetism of cobalt-doped ??-Fe<inf>2</inf>O<inf>3</inf>

陈克正

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Date of Birth:1965-10-27

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New insight in hard magnetism of cobalt-doped ??-Fe<inf>2</inf>O<inf>3</inf>

Release time:2021-03-15 Hits:

Key Words:Magnetism;Calcination - Cobalt - Cobalt compounds - Coercive force - Hematite - Iron oxides - Magnetic semiconductors

Abstract:In this work, hard magnetism was studied on cobalt-doped α-Fe<inf>2</inf>O<inf>3</inf> particles, with special regard to the evolution of coercive fields as well as exchange bias fields. It was found that the coercivity of calcined sample fell into decline as temperature rose. Quite on the contrary, the sample prior to calcination exhibited a monotonical increment as increasing temperature. Further studies showed that lattice defects and voids in α-Fe<inf>2</inf>O<inf>3</inf> host, Co-doped α-Fe<inf>2</inf>O<inf>3</inf> colonies, FeOOH magnetic lattice, and CoFe<inf>2</inf>O<inf>4</inf> impurity phase were responsible for such significantly distinct magnetism evolution. The exhibited large coercivity beyond 10 kOe and pronounced exchange bias field of −660 Oe enabled us to gain deep insight into the transition metal doped magnetic semiconductor and to promote its full exploitation in magnetic-relevant applications.<br/> © 2019 Elsevier B.V.

Volume:478

Issue:期

Translation or Not:no

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