Physical Geography and Sciences



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Devanshi Malaviya, Computer Information Systems, Elaha Hashmatullah, Physics, Md Sakhavat Hossain Himel, Computer Information Systems, and Mahmud Khan, Computer Information Systems
Faculty Mentor: Professor Arjun Pathak, Physics

Materials that exhibit ferromagnetic/antiferromagnetic to paramagnetic phase transitions around room temperature also demonstrate interesting functionalities, including magnetocaloric effects, a property that can be exploited in a magnetic refrigerator. Magnetocaloric compounds that are constituted of abundant and non-toxic elements are especially appealing to realize the commercialization of magnetic refrigeration technology. AlFe2B2 is one such material that was initially reported by Jeitschko et al. (Acta Crystallogr., Sect. B: Struct. Sci, 25 (1969) 163). Recently, a large magnetocaloric effect near room temperature (Tan et al. JACS 135 (2013)9553) was reported for the material. While AlFe2B2 is a ferromagnet with Tc = 282 K, analogous AlM2B2 alloys with M = Mn or Cr do not show magnetic ordering up to 400 K (J. Solid. State.Chem., 224, 52, 2017). It is, therefore, interesting to explore the magnetic and magnetocaloric properties of partially M doped AlFe2-xMxB2 system. Here, we present a study on the effect of physical and chemical pressure on the magnetic, magneto-transport, and magnetocaloric properties of Al1.1Fe1.85Mn0.15B2, Al1.1Fe1.85Cr0.15B2 , and Al1.1Fe1.85Mn0.08Cr0.07B2 materials by magnetometry with and without hydrostatic pressure, and transport measurements. A detailed presentation of the experimental results is provided and discussed.

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Magnetic and Magnetocaloric Properties of Al1.1Fe1.85M0.15 (M=Mn,Cr)B2
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