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磁制冷技术的发展取决于磁热效应材料的研究进展. 其中, 具有各向异性磁热效应的材料可以用于旋转磁制冷技术, 有利于制冷装置的大幅度简化. 本文研究了快淬带HoCoSi化合物的磁性、磁热效应及磁各向异性. 在Tt = 5.7 K以下的低温, HoCoSi快淬带铁磁和螺旋磁性共存, 随着温度的升高, 在TC =13.7 K处发生了铁磁(FM)到顺磁(PM)的二级相变. XRD和SEM都显示出HoCoSi具有择优取向. 为了获得大的磁热效应并确定择优取向对磁性和磁热效应的影响, 对10 m/s下HoCoSi快淬带在磁场平行和垂直织构方向时居里温度附近的等温磁化曲线进行分析, 并计算了对应的磁熵变和磁制冷能力. 在外磁场μ0H = 0—5 T的磁场变化时, 磁场平行和垂直织构方向的最大磁熵变值–ΔSM分别为22 J/(kg·K)和12 J/(kg·K); 制冷能力RC (RCP) 分别为360 (393.8) J/kg和160 (254.4) J/kg, 表明10 m/s的HoCoSi快淬带具有大的磁热效应和明显的磁各向异性, 有望实现旋转样品磁制冷技术.The performance of magnetocaloric effect materials is one of the key factors restricting the development of magnetic refrigeration technology. Materials with anisotropic magnetocaloric effect can be used in the rotary magnetic refrigeration technology, which is beneficial to the simplification of refrigeration devices. In this work, the magnetic properties, magnetocaloric effects, and magnetic anisotropies of rapidly quenched HoCoSi compounds are investigated. At low temperatures below Tt = 5.7 K, the HoCoSi ferromagnetism and helical magnetism coexist. With the increase of temperature, the HoCoSi undergoes a second-order phase transition from ferromagnetic (FM) to paramagnetic (PM) phase at TC = 13.7 K. Both XRD and SEM show that the HoCoSi has a preferred orientation. In order to obtain a large magnetocaloric effect and to determine the effect of preferred orientation on magnetism and magnetocaloric effect, the isothermal magnetization curves of the 10 m/s–HoCoSi fast quenched belt in the directions of H parallel and perpendicular to texture around the Curie temperature are analyzed. The corresponding magnetic entropy change (–ΔSM) and magnetic refrigeration capacity (RC) are calculated. Under the magnetic field changing from 0 to 5 T, the value of –ΔSM is 22 J/(kg·K) in the direction of H parallel to the texture and 12 J/(kg·K) in the direction of H perpendicular to texture , and their corresponding values of RC(RCP)are 360 (393.8) J·kg–1 and 160 (254.4) J/kg. The value of –ΔSM reaches 12.5 J/(kg·K)even at μ0H = 0–2 T in the direction of H parallel to the texture. It is obvious that the 10-m/s-HoCoSi fast quenching belt shows a large low-field magnetocaloric effect and obvious magnetic anisotropy, which is expected to be used to realize the magnetic refrigeration technology of rotating samples.
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图 1 (a)—(d)甩带速度为分别为5 m/s, 10 m/s, 15 m/s, 20 m/s的HoCoSi快淬带在自由面和贴辊面的XRD图(f代表自由面, n代表贴辊面)
Fig. 1. (a)−(d) XRD patterns of the HoCoSi fast quenched belts at 5 m/s, 10 m/s, 15 m/s, and 20 m/s on the free surface and the roller surface (f represents the free surface and n represents the roll surface).
图 2 外场为0.1 T时, 10 m/s甩带速度下的HoCoSi在ZFC和FCC两种模式下的热磁曲线, ZFC的一阶导数曲线显示在下方; 内插图为ZFC模式的1/χ-T 曲线, 实线表示Curie-Weiss拟合
Fig. 2. The temperature dependence of magnetization in ZFC and FC mode for HoCoSi of 10 m/s under the field of 0.01 T, and the corresponding ZFC first derivative curves are shown below. The 1/χ-T curve of ZFC was displayed in the insets. The solid line to inverse susceptibility shows the Curie-Weiss fit.
图 3 在5 m/s, 10 m/s, 15 m/s, 20 m/s甩带速度下HoCoSi快淬带的磁场//织构方向的等温磁化曲线 (a) T = 5 K, 插图为10 m/s的快淬带横截面的SEM图; (b) T = 17 K
Fig. 3. The magnetization isotherms of 5 m/s, 10 m/s, 15 m/s, 20 m/s HoCoSi taken in the direction of H parallel to textures: (a) T = 5 K, the SEM image of the cross-section of 10 m/s HoCoSi was displayed in the inset; (b) T = 17 K.
图 4 甩带速度10 m/s时HoCoSi快淬带在磁场平行 (a)和垂直(b)织构方向的等温磁化曲线; (c) T = 5 K, μ0H = 2 T下的转角磁化曲线
Fig. 4. The magnetization isotherms of 10 m/s HoCoSi taken in the direction of H parallel to textures (a) and H perpendicular to textures (b); (c) the magnetization as a function of rotation angle at 5 K in the magnetic field of 2 T.
图 5 10 m/s的HoCoSi快淬带的
$\Delta {S}_{\mathrm{M}}\text-T$ 变化曲线 (a)磁场平行⊥织构方向; (b)磁场垂直织构方向; 内插图为制冷能力RC随外场变化关系Fig. 5. The
$\Delta {S}_{\mathrm{M}}\text-T$ curves of 10 m/s HoCoSi: (a) In the direction of H parallel to textures; (b) in the direction of H perpendicular to textures. The corresponding magnetic refrigeration capacity RC were showed in the insets.
图 6 10 m/s下HoCoSi快淬带在磁场垂直织构方向的M-T曲线(a)和M-H曲线放大图(b)
Fig. 6. The curves of M-T (a) and M-H curve enlarged view(b)of 10 m/s HoCoSi taken in the direction of H perpendicular to the texture.
表 1 10 m/s下HoCoSi化合物的磁热参数和一些最近报道的 Δμ0H = 5 T 的有前景的低温磁制冷材料
Table 1. Magnetocaloric parameters for the 10 m/s HoCoSi compounds and some recently reported promising cryogenic magnetic refrigerants for Δμ0H = 5 T.
Compound TM /K $ \left| {\Delta S_{\text{M}}^{{\max}}} \right| $/(J·(kg·K)–1) δTFWHM/K RCP/(J·kg–1) Refs. HoCoSi(parallel) 13.7 22 17.9 393.8 This study HoCoSi(perpendicular) 13.7 12 21.2 266.4 This study Er2Ni1.5Ga2.5 4.1 15.7 18.3 254.4 [26] PrFe2Si2 8.5 6.4 17 ~100.8 [27] NdFe2Si2 15.5 12.4 11 ~116.3 [27] GdFe2Si2 8.6 23.25 9 276.56 [28] Gd2ZnMnO6 6.4 15.2 14.9 226.2 [29] Ho2ZnMnO6 6.8 13.2 18.7 246.5 [29] Ho2CrMnO6 6.1 8.8 22.0 193.7 [30] Er2CrMnO6 5.2 10.3 14.2 146.0 [30] Er2CuMnO6 3.6 9.9 19.7 195.9 [31] 
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[1] Shen B G, Sun J R, Hu F X, Zhang H W, Cheng Z H 2009 Adv. Mater. 21 4545
Google Scholar
[2] Franco V, Blázquez J S, Ingale B, Conde A 2012 Annu. Rev. Mater. Sci. 42 305
Google Scholar
[3] Zhang H, Shen B G, Xu Z Y, Shen J, Hu F X, Sun J R, Long Y 2013 Appl. Phys. Lett. 102 092401
Google Scholar
[4] Gschneidner K A Jr, Pecharsky V K, Tsokol A O 2005 Rep. Prog. Phys. 68 1479
Google Scholar
[5] Zhang H, Shen B G 2015 Chin. Phys. B 24 127504
Google Scholar
[6] 郑新奇, 沈俊, 胡凤霞, 孙继荣, 沈保根 王军民 2016 物理学报 65 217502
Google Scholar
Zheng X Q, Shen J, Hu F X, Sun J R, Shen B G 2016 Acta Phys. Sin. 65 217502
Google Scholar
[7] Li L W, Yan M 2022 JMST
[8] Zhang Y K 2019 J. Alloys Compd. 787 1173
Google Scholar
[9] Li L W, Yan M 2020 J. Alloys Compd. 823 153810
Google Scholar
[10] Nikitin S A, Skokov K P, Koshkid'ko Y S, Pastushenkov Y G, Ivanova T I 2010 Phys. Rev. Lett. 105 137205
Google Scholar
[11] Balli M, Mansouri S, Dimitrov D Z, Fournier P, Jandl S, Juang J Y 2020 Phys. Rev. Mater. 4 114411
Google Scholar
[12] Nikitin S A, Ivanova T I, Zvonov A I, Koshkid'ko Y S, Ćwik J, Rogacki K 2018 Acta Mater. 161 331
Google Scholar
[13] Liu Y, Petrovic C 2018 Phys. Rev. B 97 174418
Google Scholar
[14] Liu Y, Petrovic C 2019 Phys Rev. Mater. 3 014001
Google Scholar
[15] Zhang H, Li Y V, Liu E K, Ke Y J 2015 Sci. Rep. 5 11929
Google Scholar
[16] Zhang H, Xing C F, Zhou H, Zheng X Q, Miao X F, He L H, Chen J, Lu H L, Liu E K, Han W T, Zhang H G, Wang Y X, Long Y, Eijk L V, Brück E 2020 Acta Mater. 193 2020
[17] Barua R, Lejeune B T, Ke L, Hadjipanayis G, Levin E M, McCallum R W, Kramer M J, Lewis L H 2018 J. Alloys. Compd. 745 505
Google Scholar
[18] Welter R, Venturini G, Ressouche E, Malaman B 1994 J. Alloys Compd. 210 279
Google Scholar
[19] Gupta S, Suresh K G 2013 Mater. Lett. 113 195
Google Scholar
[20] Leciejewicz J, Stusser N, Kolenda M, Szytuta A, Zygmunt A 1996 J. Alloys Compd. 240 164
Google Scholar
[21] Yuan F, Du J, Shen B L 2012 Appl. Phys. Lett. 101 032405
Google Scholar
[22] Szytula A, Balanda M, Hofmann M, Leciejewicz J, Kolenda M, Penc B, Zygmunt A 2009 J. Appl. Phys. 105 023901
Google Scholar
[23] Wang J L, Marquina C, Ibarra M R, Wu G H 2006 Phys. Rev. B 73 094436
[24] Szytula A, Balanda M, Hofmann M, Leciejewicz J, Kolenda M, Penc B, Zygmunt A 1999 J. Magn. Magn. Mater. 191 122
Google Scholar
[25] 许志一 2012 博士学位论文 (北京: 中国科学院物理研究所)
Xu Z Y 2012 Ph. D. Dissertation (Beijing: Institute of Physics, Chinese Academy of Sciences) (in Chinese)
[26] Guo D, Zhang Y K, Wu B B, Wang H F, Guan R G, Li X, Ren Z M 2020 J. Alloy. Compd. 830 154666
Google Scholar
[27] Ma Y, Dong X, Qi Y, 2019 J. Magn. Magn. Mater. 471 25
Google Scholar
[28] Zhang Y, Zhu J, Li S, Zhang Z Q, Wang J, Ren Z M 2022 Sci. China Mater. 65 1345
Google Scholar
[29] Li L W, Xu P, Ye S K, Li Y, Liu G D, Huo D X, Yan M 2020 Acta Mater. 194 354
Google Scholar
[30] Wu B B, Guo D, Wang Y M, Zhang Y K 2020 Ceram. Int. 46 11988
Google Scholar
[31] Zhang Y K, Zhang B, Li S, Zhu J, Wu B B, Wang J, Ren Z M 2021 Ceram. Int. 47 18205
Google Scholar
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