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A PhD Student from FIST, XJTU Discovered a New Mechanism on Magnetostriction
Hits:    Update:2017/9/27 14:31:18

 

Recently, doctor candidate Shuai Ren from MMRC, FIST, XJTU, under the supervision of Prof. Xiaobing Ren, discovered a new mechanism on magnetostriction which gave rise to a low-field-triggered large magnetostriction. This study may provide a new recipe to design high performance magnetostrictive materials. This work was published online in Physical Review Letters in 23rd September, and was selected as PRL Editors’ Suggestion, The paper is titled with“Low-Field-Triggered Large Magnetostriction in Iron-Palladium Strain Glass Alloys ”. FIST is the affiliation of the first author and the corresponding author.
 
Magnetostrictive materials are a kind of smart material that is able to generate length/size change under magnetic fields, and thus has been widely used in smart devices, such as actuators, sensors and transducers. Ideal magnetostrictive materials should generate a large magnetostriction under a small magnetic field. However, conventional magnetostrictive materials only exhibit a quite small magnetostriction due to magnetic domain rotation. The magnetostriction of most of them is less than 100 ppm. On the other hand, ferromagnetic martensitic materials can generate a large magnetic-field-induced strain in principle. Due to the martensitic domain reorientation or phase transformation under a magnetic field, the field-induced strain is giant. Unfortunately, such ferromagnetic martensitic alloys need a quite high magnetic field at 1 tesla level (It means a nearly ton of magnet). Such a significant deficiency shuts the door of magnetostrictive application of ferromagnetic martensitic alloys. As a result, searching low-field-triggered large magnetostriction is a long-standing problem, and also a long-time pursue for scientists in the magnetostriction field.
 
Shuai Ren et al. discovered a new mechanism on magnetostriction based on ferromagnetic strain glass which led to a low-field-triggered large magnetostriction, and thus paved a way to solve the above problem. Ferromagnetic strain glass is a new magnetic state discovered by the group of Prof. xiaobing Ren. The microstructure is nano-sized ferromagnetic martensitic domains with glass relaxation characteristics. They found that such martensitic nano-domains in ferromagnetic strain glass can reorientate under a quite low magnetic field, and thus lead to a low-field-triggered large magnetostriction. A large magnetostriction around 800 ppm at a low field around 0.08 Tesla was found in Fe-Pd strain glass alloys by them.. A/Prof. yuanchao Ji from FIST, Prof. Sen Yang from school of science, and A/Prof. Dezhen Xue from state key laboratory for mechanical behavior of materials anticipated this work. This work was supported by National Natural Science Foundation of China Grants, and Program 973.
 
 
 
https://doi.org/10.1103/PhysRevLett.119.125701 This work provides a new mechanism and a new method to design high performance magnetostrictive materials, and may raise a new hot spot in magnetostriction community. This work was published online in Physical Review Letters in 23rd September, please see
 
 
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