Directed Magnetic Particle Transport above Artificial Magnetic Domains Due to Dynamic Magnetic Potential Energy Landscape Transformation
详细信息 查看全文
- 作者：Dennis Holzinger ; Iris Koch ; Stefan Burgard ; Arno Ehresmann
- 刊名：ACS Nano
- 出版年：2015
- 出版时间：July 28, 2015
- 年：2015
- 卷：9
- 期：7
- 页码：7323-7331
- 全文大小：456K
- ISSN：1936-086X
文摘
An approach for a remotely controllable transport of magnetic micro- and/or nanoparticles above a topographically flat exchange-bias (EB) thin film system, magnetically patterned into parallel stripe domains, is presented where the particle manipulation is achieved by sub-mT external magnetic field pulses. Superparamagnetic core鈥搒hell particles are moved stepwise by the dynamic transformation of the particles鈥?magnetic potential energy landscape due to the external magnetic field pulses without affecting the magnetic state of the thin film system. The magnetic particle velocity is adjustable in the range of 1鈥?00 渭m/s by the design of the substrate鈥檚 magnetic field landscape (MFL), the particle鈥搒ubstrate distance, and the magnitude of the applied external magnetic field pulses. The agglomeration of magnetic particles is avoided by the intrinsic magnetostatic repulsion of particles due to the parallel alignment of the particles鈥?magnetic moments perpendicular to the transport direction and parallel to the surface normal of the substrate during the particle motion. The transport mechanism is modeled by a quantitative theory based on the precise knowledge of the sample鈥檚 MFL and the particle鈥搒ubstrate distance.