3 years ago

Voltage-Induced Coercivity Reduction in Nanoporous Alloy Films: A Boost toward Energy-Efficient Magnetic Actuation

Voltage-Induced Coercivity Reduction in Nanoporous Alloy Films: A Boost toward Energy-Efficient Magnetic Actuation
Jordi Sort, Jin Zhang, Miguel Guerrero, Carlos Maria Müller, Pablo Ordejón, Bradley J. Nelson, Maria Dolors Baró, Ramón Cuadrado, Enric Menéndez, Eloy Isarain-Chávez, Josep Nogués, Salvador Pané, Eva Pellicer, Roberto Robles, Alberto Quintana
Magnetic data storage and magnetically actuated devices are conventionally controlled by magnetic fields generated using electric currents. This involves significant power dissipation by Joule heating effect. To optimize energy efficiency, manipulation of magnetic information with lower magnetic fields (i.e., lower electric currents) is desirable. This can be accomplished by reducing the coercivity of the actuated material. Here, a drastic reduction of coercivity is observed at room temperature in thick (≈600 nm), nanoporous, electrodeposited Cu–Ni films by simply subjecting them to the action of an electric field. The effect is due to voltage-induced changes in the magnetic anisotropy. The large surface-area-to-volume ratio and the ultranarrow pore walls of the system allow the whole film, and not only the topmost surface, to effectively contribute to the observed magnetoelectric effect. This waives the stringent “ultrathin-film requirement” from previous studies, where small voltage-driven coercivity variations were reported. This observation expands the already wide range of applications of nanoporous materials (hitherto in areas like energy storage or catalysis) and it opens new paradigms in the fields of spintronics, computation, and magnetic actuation in general. A novel effect in nanoporous magnetic films is demonstrated: the possibility to drastically reduce their coercivity under the action of an electric field, by simply applying continuous voltage. The reduction of coercivity with voltage implies that lower currents are needed to switch the magnetization of the system, thus considerably reducing heat dissipation and enhancing energy efficiency during magnetic actuation.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adfm.201701904

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