Magnetic and structural properties of Mn5+xGe3+y thin films as a function of substrate orientation

被引：7

作者：

de Oliveira, R. Cardoso ^{[1
]}

Demaille, D. ^{[2
]}

Casaretto, N. ^{[2
]}

Zheng, Y. J. ^{[2
]}

Marangolo, M. ^{[2
]}

Mosca, D. H. ^{[1
]}

Varalda, J. ^{[1
]}

机构：

[1] Univ Fed Parana, Dept Fis, Caixa Postal 19044, BR-81531990 Curitiba, Parana, Brazil

[2] Sorbonne Univ, CNRS, Inst NanoSci Paris, UMR7588, F-75252 Paris, France

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2021年 / 539卷

关键词：

Thin films; Magnetocaloric; TEM; X-ray diffraction; FERROMAGNETIC MN5GE3; ROOM-TEMPERATURE; MN; SPINTRONICS; GE;

D O I：

10.1016/j.jmmm.2021.168325

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Mn5Ge3 thin films were grown on GaAs(111) and GaAs(001) by Molecular Beam Epitaxy (MBE). The influence of stoichiometry and alloying of the samples was investigated using different Mn diffusion cell temperatures for each sample. X-ray diffraction (XRD) measurements reveal the following epitaxial relations: (001) Mn5Ge3// (111) GaAs and [11 0] Mn5Ge3//[2-1-1] GaAs for the sample grown on GaAs(1 1 1), and (111) Mn5Ge3//(0 0 1) GaAs and [-110] Mn5Ge3//[1 1 0] GaAs for the samples grown on GaAs(0 01). High-resolution transmission electron microscopy (HRTEM) results for a sample grown on GaAs(001) indicate that samples are around 70 nm thick and are composed of several grains with 2 different orientations corresponding to a 90 degrees rotation around the [1 11] axis. Analyzing the Mn map with energy-filtered transmission electron microscopy (EFTEM) we observed that all the grains look very similar, indicating that they contain roughly the same amount of manganese. The magnetocaloric effect found in both family of samples is spread in a wider temperature range when compared with bulk Mn5.1Ge2.9 and the magnetic entropy change peak is higher than Si- or Sb- modified Mn5Ge3. This result makes the Mn5Ge3 a possible candidate for magnetic refrigeration while being a rare earth-free material.

引用

页数：8

共 35 条

[1] Phase transitions and magnetic entropy change in Mn-rich Ni2MnGa alloys [J].

Albertini, F. ;

Paoluzi, A. ;

Pareti, L. ;

Solzi, M. ;

Righi, L. ;

Villa, E. ;

Besseghini, S. ;

Passaretti, F. .

JOURNAL OF APPLIED PHYSICS, 2006, 100 (02)

[2] Epitaxial mosaic-like Mn5Ge3 thin films on Ge(001) substrates [J].

Alvidrez-Lechuga, Adriana ;

Lopez Anton, Ricardo ;

Fuentes-Cobas, Luis E. ;

Holguin-Momaca, Jose T. ;

Solis-Canto, Oscar O. ;

Espinosa-Magana, Francisco ;

Olive-Mendez, Sion F. .

JOURNAL OF ALLOYS AND COMPOUNDS, 2018, 762 :363-369

[3] Role of the substrate temperature on the growth of Mn5Ge3 thin films by co-deposition of Mn and Ge on Ge(001) substrates by magnetron sputtering [J].

Alvidrez-Lechuga, Adriana ;

Lopez Anton, Ricardo ;

Trinidad Holguin-Momaca, Jose ;

Espinosa-Magana, Francisco ;

Federico Olive-Mendez, Sion .

THIN SOLID FILMS, 2016, 616 :111-115

[4]

[Anonymous], 1995, Chem. Phys. Lett.

[5] Tetragonal zinc-blende MnGa ultra-thin films with high magnetization directly grown on epi-ready GaAs(111) substrates [J].

Arins, A. W. ;

Jurca, H. F. ;

Zarpellon, J. ;

Varalda, J. ;

Graff, I. L. ;

de Oliveira, A. J. A. ;

Schreiner, W. H. ;

Mosca, D. H. .

APPLIED PHYSICS LETTERS, 2013, 102 (10)

[6] Advanced materials for magnetic cooling: Fundamentals and practical aspects [J].

Balli, M. ;

Jandl, S. ;

Fournier, P. ;

Kedous-Lebouc, A. .

APPLIED PHYSICS REVIEWS, 2017, 4 (02)

[7] The Effect of Fe Doping on the Magnetic and Magnetocaloric Properties of Mn5-xFexGe3 [J].

Brock, Jeffrey ;

Bell-Pactat, Nathanael ;

Cai, Hong ;

Dennison, Timothy ;

Fox, Tucker ;

Free, Brandon ;

Mahyub, Rami ;

Nar, Austin ;

Saaranen, Michael ;

Schaeffer, Tiago ;

Khan, Mahmud .

ADVANCES IN MATERIALS SCIENCE AND ENGINEERING, 2017, 2017

[8] Influence of Co and Ni addition on the magnetocaloric effect in Fe88-2xCoxNixZr7B4Cu1 soft magnetic amorphous alloys [J].

Caballero-Flores, R. ;

Franco, V. ;

Conde, A. ;

Knipling, K. E. ;

Willard, M. A. .

APPLIED PHYSICS LETTERS, 2010, 96 (18)

[9] Modulating the phase transition temperature of giant magnetocaloric thin films by ion irradiation [J].

Cervera, S. ;

Trassinelli, M. ;

Marangolo, M. ;

Carretero, C. ;

Garcia, V. ;

Hidki, S. ;

Jacquet, E. ;

Lamour, E. ;

Levy, A. ;

Mace, S. ;

Prigent, C. ;

Rozet, J. P. ;

Steydli, S. ;

Vernhet, D. .

PHYSICAL REVIEW MATERIALS, 2017, 1 (06)

[10]

Champness P.E., 2001, Electron diffraction in the transmission electron microscope, V1

← 1 2 3 4 →