Sreenivasulu Kummari V, Srikanth Vadali V S S
School of Engineering Sciences and Technology, University of Hyderabad, Hyderabad, India.
Recent Pat Nanotechnol. 2017 Jul 10;11(2):116-122. doi: 10.2174/1872210510666161027160700.
In this brief review, the importance of nanotechnology in developing novel magnetic energy storage materials is discussed.
The discussion covers recent patents on permanent magnetic materials and especially covers processing of permanent magnets (rare-earth and rare-earth free magnets), importance of rare-earth permanent magnets and necessity of rare-earth free permanent magnets. Magnetic energy storage materials are those magnetic materials which exhibit very high energy product (BH)max (where B is the magnetic induction in Gauss (G) whereas H is the applied magnetic field in Oersted (Oe)). (BH)max is the direct measure of the ability of a magnetic material to store energy.
In this context, processing of magnetic energy storage composite materials constituted by soft and hard magnetic materials played a predominant role in achieving high (BH)max values due to the exchange coupling phenomenon between the soft and hard magnetic phases within the composite. Magnetic energy storage composites are normally composed of rare-earth magnetic materials as well as rare-earth free magnetic materials.
Nanotechnology's influence on the enhancement of energy product due to the exchange coupling phenomenon is of great prominence and therefore discussed in this review.
在这篇简短的综述中，讨论了纳米技术在开发新型磁储能材料中的重要性。
讨论涵盖了永磁材料的近期专利，尤其涉及永磁体（稀土永磁体和非稀土永磁体）的加工、稀土永磁体的重要性以及非稀土永磁体的必要性。磁储能材料是那些具有非常高的最大能量积（BH）max的磁性材料（其中B是以高斯（G）为单位的磁感应强度，而H是以奥斯特（Oe）为单位的外加磁场）。（BH）max是磁性材料储能能力的直接度量。
在这种情况下，由软磁材料和硬磁材料构成的磁储能复合材料的加工，由于复合材料中软磁相和硬磁相之间的交换耦合现象，在实现高（BH）max值方面发挥了主导作用。磁储能复合材料通常由稀土磁性材料以及非稀土磁性材料组成。
纳米技术因交换耦合现象对提高能量积的影响非常显著，因此在本综述中进行了讨论。
