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    • 3. 发明申请
    • MAGNETIC EXCHANGE COUPLED CORE-SHELL NANOMAGNETS
    • 磁性交换耦合核心纳米级网络
    • WO2012068178A1
    • 2012-05-24
    • PCT/US2011/060879
    • 2011-11-15
    • THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ALABAMA FOR AND ON BEHALF OF THE UNIVERSITY OF ALABAMAHONG, Yang-kiBAE, Seok
    • HONG, Yang-kiBAE, Seok
    • G11B5/00
    • H01F1/0302G11B5/706H01F1/0054H01F1/061H01F3/00
    • A permanent magnet (12) is fabricated such that it has a magnetically hard core (14) surrounded by a thin magnetically soft shell (15). The magnetically hard core provides a relatively high intrinsic coercivity (H ci ), and the magnetically soft shell provides a relatively high magnetic flux density (B). Due to magnetic exchange coupling between the core and shell, a relatively high maximum energy product (5H) max is achievable over a wide temperature range, including temperatures above 150 °C. Further, such effects can be achieved without using rare-earth metals or precious metals helping to keep the manufacturing costs of the magnet low. To allow sufficient exchange magnetic coupling between the core and shell, the width of the shell is less than about 40 nanometers, and the overall dimensions are controlled such that the width of the shell is less than two times the Bloch domain wall thickness of the core.
    • 制造永磁体(12),使得其具有被薄磁软壳(15)包围的磁性硬芯(14)。 磁性硬芯提供相对较高的固有矫顽力(Hci),并且磁软壳提供较高的磁通密度(B)。 由于芯和壳之间的磁交换耦合,在宽温度范围(包括高于150℃的温度)下可实现相对较高的最大能量乘积(5H)max。 此外,可以在不使用稀土金属或贵金属的情况下实现这样的效果,有助于保持磁体的制造成本低。 为了允许芯和壳之间的充分的交换磁耦合,壳的宽度小于约40纳米,并且整体尺寸被控制,使得壳的宽度小于芯的Bloch畴壁厚度的两倍 。