Stress-Induced Domain Wall Motion in FeCo-Based Magnetic Microwires for Realization of Energy Harvesting
Stress-Induced Domain Wall Motion in FeCo-Based Magnetic Microwires for Realization of Energy Harvesting
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DOI：
10.1002/aelm.201800467
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发表时间：
2019-01-01
影响因子：
6.2
通讯作者：
Piramanayagam, S. N.
中科院分区：
文献类型：
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作者：
Bhatti, Sabpreet;Ma, Chuang;Piramanayagam, S. N.
由于物联网(IoT)的出现，能源采集受到了极大的关注。由于物联网设备需要自己发电，几位研究人员正在研究用于电压发电的铁电材料。然而，铁电材料在低频下存在高阻的问题，这降低了输出功率。作为能量收集的另一种形式，研究了由应力和线圈产生的拾取电压引起的铁磁材料中的磁化壁传播。这类研究发表在《多铁性结构》杂志上，其特点是施加电压来感应应力，这违背了自我发电的目的。在这里，显示了纯铁磁结构中机械振动的发电。这些结果是通过显示在铁磁性微丝的三层堆叠中的应力可以完全移动磁区壁而实现的。使用具有低杨氏模数的柔性基板和三层磁性堆栈，即使在环境振动的情况下也能实现显著的磁化旋转或磁化壁运动。这里，利用磁化的旋转或磁化壁运动来在拾取线圈中感应电压。此处显示的结果为物联网设备提供了另一种供电方式。
Energy harvesting is getting significant interest due to the emergence of Internet of Things (IoT). As IoT devices are required to generate power on their own, several researchers are studying ferroelectric materials for voltage generation. However, ferroelectric materials suffer from high resistance at low frequencies, which reduces the output power. Domain wall propagation in ferromagnetic materials, as induced by stress and a pickup voltage using coils, is investigated as an alternate form of energy harvesting. Such studies, which are reported in multiferroic structures, feature a voltage applied to induce the stress, which defeats the purpose of self-power generation. Here, power generation from mechanical vibrations in purely ferromagnetic structures is shown. These results are achieved by showing that the domain walls can be moved entirely by stress in a trilayer stack of ferromagnetic microwires. The use of flexible substrates with low Young's modulus and a trilayer magnetic stack enables the achievement of significant magnetization rotation or domain wall motion even from ambient vibrations. Here, the rotation of magnetization or domain wall motion is exploited to induce voltages in the pickup coils. The results shown here provide an alternative way to power IoT devices.