Perpendicular magnetic clusters with configurable domain structures via dipole–dipole interactions

Autor: Guchang Han, Seng Kai Wong, Tun Seng Herng, Lee Koon Yap, Jun Ding, Cheow Hin Sim, Zhengchun Yang, Yunjie Chen, Weimin Li, J.Z. Shi, Junmin Xue
Rok vydání: 2015
Předmět:
Zdroj: Nano Research. 8:3639-3650
ISSN: 1998-0000
1998-0124
DOI: 10.1007/s12274-015-0864-1
Popis: Magnetic single-domain islands based on in-plane anisotropy (usually, shape anisotropy) and their dipole—dipole interactions have been investigated extensively in recent years. This has been driven by potential applications in magnetic recording, spintronics, magneto-biology, etc. Here, we propose a concept of outof-plane magnetic clusters with configurable domain structures (multi-flux states) via dipole—dipole interactions. Their flux stages can be switched through an external magnetic field. The concept has been successfully demonstrated by patterned [Co/Pd] islands. A [Co/Pd] multilayer exhibits a large perpendicular anisotropy, a strong physical separation, and uniform intrinsic properties after being patterned into individual islands by electron beam lithography. A threeisland cluster with six stable flux states has been realized by optimizing island size, thickness, gap, anisotropy, saturation magnetization, etc. Using [Co/Pd] multilayers, we have optimized the island structure by tuning magnetic properties (saturation magnetization and perpendicular anisotropy) using Landau—Liftshitz—Gilbert (LLG) simulation/calculation. Potential applications have been proposed, including a flexi-programmable logic device with AND, OR, NAND, and NOR functionalities and a magnetic domino, which can propagate magnetic current as far as 1 µm down from the surface via vertical dipole—dipole interactions.
Databáze: OpenAIRE
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