Electric-field effects on thickness dependent magnetic anisotropy of sputtered MgO/Co40Fe40B20/Ta structures

被引：430
作者：
Endo, M. [1 ]
Kanai, S. [1 ]
Ikeda, S. [1 ,2 ]
Matsukura, F. [1 ,2 ]
Ohno, H. [1 ,2 ]
机构：
[1] Tohoku Univ, Elect Commun Res Inst, Lab Nanoelect & Spintron, Aoba Ku, Sendai, Miyagi 9808577, Japan
[2] Tohoku Univ, Ctr Spintron Integrated Syst, Aoba Ku, Sendai, Miyagi 9808577, Japan
来源：
APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 21期
关键词：
boron alloys; cobalt alloys; coercive force; iron alloys; magnesium compounds; magnetic multilayers; magnetoelectric effects; metal-insulator boundaries; perpendicular magnetic anisotropy; superparamagnetism; tantalum; TUNNEL-JUNCTIONS; MANIPULATION; TEMPERATURE; MULTILAYERS;
D O I：
10.1063/1.3429592
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have investigated the effect of applied electric field E-G on thickness dependent magnetic anisotropy of sputtered Co40Fe40B20 sandwiched with MgO and Ta. The range of CoFeB thickness explored is 2 nm and below. As the thickness is reduced, the easy axis of magnetization becomes perpendicular from in-plane. We show that perpendicular magnetic anisotropy of in-plane samples and coercivity of perpendicular samples can be modified by applying E-G at room temperature. Furthermore, superparamagnetic behavior is observed for CoFeB layers with further reduced thickness below approximate to 0.9 nm, where electric-field effect is also observed below their blocking temperature. (C) 2010 American Institute of Physics. [doi:10.1063/1.3429592]
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页数：3
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