High Frequency Thermal Energy Harvesting Using Magnetic Shape Memory Films

被引：66

作者：

Gueltig, Marcel ^{[1
]}

Ossmer, Hinnerk ^{[1
]}

Ohtsuka, Makoto ^{[2
]}

Miki, Hiroyuki ^{[3
]}

Tsuchiya, Koki ^{[4
]}

Takagi, Toshiyuki ^{[4
]}

Kohl, Manfred ^{[1
]}

机构：

[1] Karlsruhe Inst Technol KIT, Inst Microstruct Technol, D-76021 Karlsruhe, Germany

[2] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan

[3] Tohoku Univ, Frontier Res Inst Interdisciplinary Sci, Sendai, Miyagi 9808577, Japan

[4] Tohoku Univ, Inst Fluid Sci, Sendai, Miyagi 9808577, Japan

来源：

ADVANCED ENERGY MATERIALS | 2014年 / 4卷 / 17期

关键词：

NI2MNGA SPUTTERED FILMS; ALLOYS; PHASE; TRANSFORMATION; HEAT;

D O I：

10.1002/aenm.201400751

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A new method for thermal energy harvesting at small temperature difference and high cycling frequency is presented that exploits the unique magnetic properties and actuation capability of magnetic shape memory alloy (MSMA) films. Polycrystalline films of the Ni50.4Co3.7Mn32.8In13.1 alloy are tailored, showing a large abrupt change of magnetization and low thermal hysteresis well above room temperature. Based on this material, a free-standing film device is designed that exhibits thermomagnetically induced actuation between a heat source and sink with short heat transfer times. The cycling frequency of the device is tuned by mechanical frequency up-conversion to over 200 Hz. An integrated pick-up coil converts the thermally induced change of magnetization as well as the kinetic energy to electricity. For a temperature change of 10 K, the maximum peak power density is in the order of 5 mW cm(-3).

引用

页数：8

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