Magnetocaloric effects of binary rare earth mononitrides, GdxTb1−xN and TbxHo1−xN

Nakagawa, Takashi; Sako, Kengo; Arakawa, Takayuki; Tomioka, Naoto; Yamamoto, Takao A.; Kamiya, Kōji; Numazawa, Takenori

doi:10.1016/j.jallcom.2005.04.046

Cited by 22 publications

(8 citation statements)

References 10 publications

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“…To date it is only GdN that has been subjected to very thorough experimental investigation, as will be realised very quickly on reading this review. Finally, there are reports of catalytic 18 and large magneto-caloric [19][20][21][22][23][24][25] effects in the RENs, suggesting them as promising candidates for magnetic refrigeration. Thin films are unlikely to contribute to these technologies.…”

Section: The Basis Of Potential Exploitationmentioning

confidence: 99%

Rare-earth mononitrides

Natali

Ruck

Plank

et al. 2013

Progress in Materials Science

158

240

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When the rare earth mononitrides (RENs) first burst onto the scientific scene in the middle of last century, there were feverish dreams that their strong magnetic moment would afford a wide range of applications. For decades research was frustrated by poor stoichiometry and the ready reaction of the materials in ambient conditions, and only recently have these impediments finally been overcome by advances in thin film fabrication with ultra-high vacuum based growth technology. Currently, the field of research into the RENs is growing rapidly, motivated by the materials demands of proposed electronic and spintronic devices. Both semiconducting and ferromagnetic properties have been established in some of the RENs which thus attract interest for the potential to exploit the spin of charge carriers in semiconductor technologies for both fundamental and applied science. In this review, we take stock of where progress has occurred within the last decade in both theoretical and experimental fields, and which has led to the point where a proof-of-concept spintronic device based on RENs has already been demonstrated. The article is organized into three major parts. First, we describe the epitaxial growth of REN thin films and their structural properties, with an emphasis on their prospective spintronic applications. Then, we conduct a critical review of the different advanced theoretical calculations utilised to determine both the electronic structure and the origins of the magnetism in these compounds. The rest of the review is devoted to the recent experimental results on optical, electrical and magnetic properties and their relation to current theoretical descriptions. These results are discussed particularly with regard to the controversy about the exact nature of the magnetic state and conduction processes in the RENs.Comment: 34 pages, 14 figure

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Section: The Basis Of Potential Exploitationmentioning

confidence: 99%

Rare-earth mononitrides

Natali

Ruck

Plank

et al. 2013

Progress in Materials Science

158

240

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“…For example, existence and stability of several magnetic arrangements (cone-, screw-, fan-, and ferromagnetic-types structures) were studied in MnP single crystal; 3 the discovery of an anomaly in the paramagnetic compound PrNi 5 , in which the magnetic entropy increases increasing magnetic field; 4 the influence of the charge-ordering 5 on heat capacity and DS T in manganite Nd 0.5 Sr 0.5 MnO 3 ; giant MCE caused by rotation of the magnetization vector in NdCo 5 single crystal; 6 evidences for Bose-Einstein condensate ground state in the spin dimer system Sr 3 Cr 2 O 8 have been addressed in the literature through heat capacity and MCE measurements. 7 Experimental investigations on the magnetocaloric effect have been performed in rare earth mononitrides systems [8][9][10][11][12] RN (R ¼ Er, Ho, Dy, Tb, and Gd) and in binary rare earth systems Gd y Tb 1Ày N, Tb y Ho 1Ày N, Gd y Dy 1Ày N, and Ho y Er 1Ày N. Some advantages were pointed out in the above references to consider rare earth mononitrides as refrigerant materials to be used in magnetic refrigeration, especially for the liquefaction of hydrogen. The raised main advantages are (1) refrigerants based in rare earth mononitrides are inert to hydrogen, i.e., do not change properties even in contact with hydrogen; and (2) Rare earth mononitrides are formed in NaCl crystalline structure presenting high rare earth packing density, also the cubic lattice parameter changes linearly (obeying the Vegard's law) with rare earth ions concentration.…”

Section: Introductionmentioning

confidence: 99%

Spin reorientation and the magnetocaloric effect in HoyEr(1−y)N

Ranke

Alvarenga

Alho

et al. 2012

Journal of Applied Physics

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We report on the magnetic and magnetocaloric effect calculations in rare earth mononitrides Ho y Er (1Ày) N (y ¼ 0, 0.5, 0.75, and 1). The magnetic Hamiltonian includes the crystalline electrical field in both magnetic sublattices; disorder in exchange interactions among Ho-Ho, Er-Er, and Ho-Er magnetic ions and the Zeeman effect. The theoretical results for the magnetic entropy change and adiabatic temperature change are in good agreement with the available experimental data. Besides, ferrimagnetic arrangement, inverse magnetocaloric effect, and spin reorientation transition (spin flop process) were predicted and quantitatively described. V C 2012 American Institute of Physics.

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“…The magnetic refrigeration is based on a physical phenomenon, magnetocaloric effect, and promising cooling technology especially at cryogenic temperatures [4,5]. Therefore, the rare-earth mononitirides would be promising materials applicable (i) to the magnetic cooling and liquefaction of hydrogen occurring at 20 K from the liquid nitrogen temperature, and (ii) to the regenerator used under 20 K. We have synthesized mononitrides of Gd [6,9], Tb [7,9], Dy [6], Ho [7], Er [8] and binary solid solutions thereof, Gd-Dy [6], Gd-Tb [9], Tb-Ho [9], by the carbothermic reduction (CTR) method, and demonstrated that their magnetic entropy changes S accompanied with the ferro-para transition are larger than those of the other candidate materials of the second-order magnetic phase transition (SOMT). The SOMT material experiences no structural change induced by the iterative magnetize-demagnetize operation and is free from material degradation as experienced by materials of the first-order magnetic phase transition.…”

Section: Introductionmentioning

confidence: 99%