关键字：Hematite; Magnetic dead layer; Surface; Magnetic activity; Paramagnetic
摘要：The presence of magnetic dead layer is usually supposed to cause a degradation of magnetism due to highly frustrated spin configurations. In this Letter, we report a diametrically opposite experimental and theoretical investigation as to hematite nanocubes, in which the magnetic dead layer, calculated to be 3.2 nm-thick in average as for 25 nm-sized cubes, is found to be of high magnetic activity and hence dominating many of the cubes' magnetic features, including paramagnetic attribute of thermo-magnetic curves, good reversibility of high-field magnetization and obvious exchange bias effect in zero-field cooled procedure at low temperatures. (C) 2013 Elsevier B.V. All rights reserved.
卷号：377
期号：34-36
是否译文：否