TITLE

Simple enhancement of the magnetocaloric effect in giant magnetocaloric materials

AUTHOR(S)
Lewis, L. H.; Yu, M. H.; Gambino, R. J.
PUB. DATE
July 2003
SOURCE
Applied Physics Letters;7/21/2003, Vol. 83 Issue 3, p515
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A simple method of enhancing the magnetocaloric effect (MCE)) in ferromagnetic materials is described. Thin layers of pure Fe of 0.1- and 0.2-μm thickness were evaporated onto both sides of polished 0.6-mm, slices of the giant magnetocaloric material Gd[SUB5]Si[SUB1.5]Ge[SUB2.5]. The slices were stacked for magnetic measurement in the temperature range from 165 to 235 K to assess the MCE. Sample geometries with the iron layers oriented both parallel and perpendicular to the applied field were measured. In the metamagnetic transition temperature range, the Fe layer in the parallel geometry lowers the onset field of the metamagnetic transition by 4240 Oe for the 0.1-μm layer thickness and by 4940 Oe for the 0.2-μm layer thickness from the base value of 8700 Oe at 187 K in the absence of Fe layers. Furthermore, the 0.1-μm layer of Fe oriented perpendicular to the applied field is found to enhance the entropy change, and thus the magnetocaloric effect, by approximately 11% above its base value at 191.5 K; intriguingly, the 0.2-μm Fe layer does not obviously alter the MCE from its base value.
ACCESSION #
10281593

 

Related Articles

  • Nuclear magnetic resonance study of magnetic phase segregation in La[sub 1-x]Ca[sub x]MnO[sub 3]. Kapusta, Cz.; Riedi, P. C.; Kocemba, W.; Ibarra, M. R.; Coey, J. M. D. // Journal of Applied Physics;5/1/2000, Vol. 87 Issue 9, p7121 

    A [sup 55]Mn nuclear magnetic resonance (NMR) study of the La[sub 1-x]Ca[sub x]MnO[sub 3] system, 00.5 the spin echo spectra contain resonance lines corresponding to both the microscopic ferromagnetic and antiferromagnetic regions. A resonance line near 380...

  • Automized magnetic hysteresis measurement system. Disselnkötter, Rolf // Journal of Applied Physics;4/15/1996, Vol. 79 Issue 8, p5208 

    Discusses a study which designed an automized magnetic hysteresis measurement system for the characterization of the low frequency soft magnetic behavior of ferromagnetic samples. Description of the hardware; Information on the software; Measurement of the magnetization curve and Rayleigh loop.

  • Magneto-optical measurements on mechanically stressed thin ferromagnetic films. Callegaro, Luca; Puppin, Ezio; Vannucchi, Alessandro // Review of Scientific Instruments;Feb1995, Vol. 66 Issue 2, p1065 

    Demonstrates how magneto-optical techniques provide a unique tool for magnetic measurements on thin ferromagnetic films stressed by external forces. Ellipsometer; Sample holder; Measurement of longitudinal Kerr hysteresis cycles; Coercive force.

  • Hopkinson-Like Effect in Single-Crystalline CdCr2Se4 and Cd[Cr1.89Ti0.08]Se4. Malicka, E.; Groń, T.; Pacyna, A. W.; Duda, H.; Krok-Kowalski, J. // Acta Physica Polonica, A.;Mar2012, Vol. 121 Issue 3, p690 

    The static (dc) and dynamic (ac) magnetic measurements of CdCr2Se4 and Cd[Cr1.89Ti0.08]Se4 showed their ferromagnetic properties with a Curie temperature TC ≈ 130 K and revealed on the real component of ac susceptibility curve, the peaks near TC at 200 Oe, 450 Oe and 1 kOe, characteristic...

  • Creating uniform magnetization in short cylindrical ferromagnetic samples. Gal'chenko, V.; Yakimov, A. // Russian Journal of Nondestructive Testing;Apr2014, Vol. 50 Issue 4, p198 

    A method is proposed to achieve uniform magnetization in ferromagnetic samples based on the bionic parametric optimal synthesis of the magnetization source that provides the necessary magnetization distribution. Simulation results are reported that illustrate the efficiency of the method....

  • A New Barkhausen Noise Technique for Applications at Miniaturized Geometries. Hillmann, Susanne; Meyendorf, Norbert // AIP Conference Proceedings;2014, Vol. 1581, p1293 

    The magnetic Barkhausen Noise technique is a well suited method for the characterization of ferromagnetic materials. Most sensors are composed of a magnetic yoke that excites the electromagnetic field in the material, and a coil or Hall-Element, which is located between both feet of the yoke to...

  • Magnetic dissipation microscopy in ambient conditions. Proksch, Roger; Babcock, Ken; Cleveland, Jason // Applied Physics Letters;1/18/1999, Vol. 74 Issue 3, p419 

    Quantifies sub-picowatt power losses in very soft (yttrium iron garnets) and relatively hard (metal evaporated tape) ferromagnetic materials associated with dissipative micromagnetic processes during magnetic force microscopic imaging. Power resolution; Spatial correlation between peak...

  • Mössbauer Spectroscopy Studies on Magnetic Properties for 57Fe-substituted Ni-Mn-Sn Metamagnetic Shape Memory Alloys. Rie Y. Umetsu; Kenji Sano; Kouji Fukushima; Takeshi Kanomata; Yusuke Taniguchi; Yasushi Amako; Ryosuke Kainuma // Metals (2075-4701);Jun2013, Vol. 3 Issue 2, p225 

    In order to investigate the Fe substituted effects on the magnetic properties of the Ni-Mn-Sn metamagnetic shape memory alloys, magnetization and the Mössbauer spectroscopy measurements were carried out with using 57Fe-doped specimens of Ni2Mn1.48--x57FexSn0.52 (x = 0.02, 0.04 and 0.08)....

  • 0-Ï€ oscillations in nanostructured Nb/Fe/Nb Josephson junctions. Piano, S.; Robinson, J. W. A.; Burnell, G.; Blamire, M. G. // European Physical Journal B -- Condensed Matter;Jul2007, Vol. 58 Issue 2, p123 

    The physics of the π phase shift in ferromagnetic Josephson junctions may enable a range of applications for spin-electronic devices and quantum computing. We investigate transitions from “0” to “π” states in Nb/Fe/Nb Josephson junctions by varying the Fe barrier...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics