“…The RMnO3 (R = rare earth) manganites have generated worldwide interest due to their rich physical properties and potential implementation in a wide range of applications going from spintronics such as four state memory systems [37] to magnetocaloric refrigeration [20][21][22][23][24]26,27]. In these highly frustrated multiferroics, the magnetic, electric and crystallographic structures are markedly coupled and strongly depend on the rare earth element size (rR) [22,27,[65][66][67][68].…”
Section: Magnetocaloric Properties Of Rmno3 Multiferroic Crystalsmentioning
confidence: 99%
“…In these highly frustrated multiferroics, the magnetic, electric and crystallographic structures are markedly coupled and strongly depend on the rare earth element size (rR) [22,27,[65][66][67][68]. Usually, the RMnO3 systems with larger ionic radius of R (typically rR >rDy) crystallize in an orthorhombic structure illustrated in Figure 3 (Pbnm space group) [27,[65][66][67][68].…”
Section: Magnetocaloric Properties Of Rmno3 Multiferroic Crystalsmentioning
confidence: 99%
“…In addition, as claimed by Barclay et al [18], a large scale utilization of hydrogen as a source of energy will result in better energy security with major environmental, economic, and social benefits. In this context, several cryomagnetocaloric materials have been proposed [19][20][21][22][23][24][25][26][27][28]. Following this, Matsumoto et al [29,30] unveiled a reciprocating magnetic refrigerator dedicated to hydrogen liquefaction that uses the Dy 2.4 Gd 0.6 Al 5 O 12 garnet as refrigerant.…”
Section: Introductionmentioning
confidence: 99%
“…Especially, some of these systems show a strong coupling between magnetism and ferroelectricity which provides an additional degree of freedom regarding the design of magnetoelectric effect-based machines [30][31][32][33][34][35][36][37][38][39][40]. On the other hand, the investigation of their magnetocaloric properties has unveiled a great potential for application in magnetic refrigeration at low temperature regime [19][20][21][22][23][24][25][26][27][28]. This means that more than one task can be achieved by only using a single RMn 2 O 5 or RMnO 3 material which is of great interest from an economical point of view.…”
Abstract:It is known that some of RMnO 3 and RMn 2 O 5 (R = rare earth) multiferroic crystals reveal a strong interplay between their magnetic and electric order parameters, paving the way for applications in spintronic technologies. Additionally, recent works have also pointed out their potential utilization as refrigerants in magnetocaloric cooling systems for cryogenic tasks. In this paper, recent advances regarding the magnetocaloric properties of both RMnO 3 and RMn 2 O 5 families of multiferroics are reviewed. With the aim of understanding the RMnO 3 and RMn 2 O 5 magnetocaloric features, their structural and magnetic properties are discussed. The physics behind the magnetocaloric effect as well as some of its key thermodynamic aspects are also considered.
“…The RMnO3 (R = rare earth) manganites have generated worldwide interest due to their rich physical properties and potential implementation in a wide range of applications going from spintronics such as four state memory systems [37] to magnetocaloric refrigeration [20][21][22][23][24]26,27]. In these highly frustrated multiferroics, the magnetic, electric and crystallographic structures are markedly coupled and strongly depend on the rare earth element size (rR) [22,27,[65][66][67][68].…”
Section: Magnetocaloric Properties Of Rmno3 Multiferroic Crystalsmentioning
confidence: 99%
“…In these highly frustrated multiferroics, the magnetic, electric and crystallographic structures are markedly coupled and strongly depend on the rare earth element size (rR) [22,27,[65][66][67][68]. Usually, the RMnO3 systems with larger ionic radius of R (typically rR >rDy) crystallize in an orthorhombic structure illustrated in Figure 3 (Pbnm space group) [27,[65][66][67][68].…”
Section: Magnetocaloric Properties Of Rmno3 Multiferroic Crystalsmentioning
confidence: 99%
“…In addition, as claimed by Barclay et al [18], a large scale utilization of hydrogen as a source of energy will result in better energy security with major environmental, economic, and social benefits. In this context, several cryomagnetocaloric materials have been proposed [19][20][21][22][23][24][25][26][27][28]. Following this, Matsumoto et al [29,30] unveiled a reciprocating magnetic refrigerator dedicated to hydrogen liquefaction that uses the Dy 2.4 Gd 0.6 Al 5 O 12 garnet as refrigerant.…”
Section: Introductionmentioning
confidence: 99%
“…Especially, some of these systems show a strong coupling between magnetism and ferroelectricity which provides an additional degree of freedom regarding the design of magnetoelectric effect-based machines [30][31][32][33][34][35][36][37][38][39][40]. On the other hand, the investigation of their magnetocaloric properties has unveiled a great potential for application in magnetic refrigeration at low temperature regime [19][20][21][22][23][24][25][26][27][28]. This means that more than one task can be achieved by only using a single RMn 2 O 5 or RMnO 3 material which is of great interest from an economical point of view.…”
Abstract:It is known that some of RMnO 3 and RMn 2 O 5 (R = rare earth) multiferroic crystals reveal a strong interplay between their magnetic and electric order parameters, paving the way for applications in spintronic technologies. Additionally, recent works have also pointed out their potential utilization as refrigerants in magnetocaloric cooling systems for cryogenic tasks. In this paper, recent advances regarding the magnetocaloric properties of both RMnO 3 and RMn 2 O 5 families of multiferroics are reviewed. With the aim of understanding the RMnO 3 and RMn 2 O 5 magnetocaloric features, their structural and magnetic properties are discussed. The physics behind the magnetocaloric effect as well as some of its key thermodynamic aspects are also considered.
“…However, the search for materials with excellent magnetocaloric properties in the temperature range from about 2 to 30 K is of great interest from fundamental, practical, and economical points of view, due to their potential use as refrigerants in several low temperature applications such as the space industry, scientific instruments, and gas liquefaction [14][15][16][17][18][19][20][21][22][23][24][25]. On the other hand, the development of new designs that can render magnetic cooling more competitive is also a key parameter for the commercialization of this emergent technology.…”
Thanks to the strong magnetic anisotropy shown by the multiferroic RMn 2 O 5 (R = magnetic rare earth) compounds, a large adiabatic temperature change can be induced (around 10 K) by rotating them in constant magnetic fields instead of the standard magnetization-demagnetization method. Particularly, the TbMn 2 O 5 single crystal reveals a giant rotating magnetocaloric effect (RMCE) under relatively low constant magnetic fields reachable by permanent magnets. On the other hand, the nature of R 3+ ions strongly affects their RMCEs. For example, the maximum rotating adiabatic temperature change exhibited by TbMn 2 O 5 is more than five times larger than that presented by HoMn 2 O 5 in a constant magnetic field of 2 T. In this paper, we mainly focus on the physics behind the RMCE shown by RMn 2 O 5 multiferroics. We particularly demonstrate that the rare earth size could play a crucial role in determining the magnetic order, and accordingly, the rotating magnetocaloric properties of RMn 2 O 5 compounds through the modulation of exchange interactions via lattice distortions. This is a scenario that seems to be supported by Raman scattering measurements.
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