Structural and magnetic properties of cubic and tetragonal Heusler alloy bilayers

R. Ranjbar; K. Suzuki; A. Sugihara; Q. L. Ma; X. M. Zhang; Y. Ando; T. Miyazaki; S. Mizukami

doi:10.1016/j.matdes.2016.02.047

Structural and magnetic properties of cubic and tetragonal Heusler alloy bilayers

R. Ranjbar, K. Suzuki, A. Sugihara, Q. L. Ma, X. M. Zhang, Y. Ando, T. Miyazaki, S. Mizukami

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

Different cubic Co-based Heusler alloys - Co ₂FeAl (CFA), Co ₂FeSi (CFS), Co ₂MnAl (CMA), and Co ₂MnSi (CMS) - were grown epitaxially on tetragonal Heusler-like D0 ₂₂-MnGa at different annealing temperatures (T_a) in the form of Heusler (20 nm)/MnGa (30 nm) bilayers. The CMA/MnGa bilayer showed the largest critical temperature (450 C), indicating good structural stability against interdiffusion. The experimental results showed an easier interdiffusion of the Fe and Si elements than of Mn and Al. An inverted hysteresis loop was observed in a polar magneto-optical Kerr effect (P-MOKE) measurement for the CFS/MnGa, CMA/MnGa, and CMS/MnGa bilayers. This is one piece of evidence for the existence of the antiferromagnetic (AFM) interfacial exchange coupling (J _ex). We evaluated J _ex for the Heusler/MnGa bilayers annealed at different temperatures. J _ex changed from ferromagnetic (FM) to AFM after annealing at 300 C for the CFA/MnGa bilayer. Other bilayers showed only AFM coupling. The strongest J _ex value of approximately -3.2 erg/cm ² was obtained for the CMS/MnGa bilayer annealed at 400 C. It was found that the tendency of the Mn and Si elements to make AFM J _ex in the Heusler/MnGa bilayers interfaces is larger than that of Fe and Al.

Original language	English
Pages (from-to)	490-498
Number of pages	9
Journal	Materials and Design
Volume	96
DOIs	https://doi.org/10.1016/j.matdes.2016.02.047
Publication status	Published - 2016 Apr 15

Keywords

Heusler film
Interfacial exchange coupling
MnGa film

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

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10.1016/j.matdes.2016.02.047

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@article{2764f58470ad4cad8dd6e54d64757c13,

title = "Structural and magnetic properties of cubic and tetragonal Heusler alloy bilayers",

abstract = "Different cubic Co-based Heusler alloys - Co 2FeAl (CFA), Co 2FeSi (CFS), Co 2MnAl (CMA), and Co 2MnSi (CMS) - were grown epitaxially on tetragonal Heusler-like D0 22-MnGa at different annealing temperatures (Ta) in the form of Heusler (20 nm)/MnGa (30 nm) bilayers. The CMA/MnGa bilayer showed the largest critical temperature (450 C), indicating good structural stability against interdiffusion. The experimental results showed an easier interdiffusion of the Fe and Si elements than of Mn and Al. An inverted hysteresis loop was observed in a polar magneto-optical Kerr effect (P-MOKE) measurement for the CFS/MnGa, CMA/MnGa, and CMS/MnGa bilayers. This is one piece of evidence for the existence of the antiferromagnetic (AFM) interfacial exchange coupling (J ex). We evaluated J ex for the Heusler/MnGa bilayers annealed at different temperatures. J ex changed from ferromagnetic (FM) to AFM after annealing at 300 C for the CFA/MnGa bilayer. Other bilayers showed only AFM coupling. The strongest J ex value of approximately -3.2 erg/cm 2 was obtained for the CMS/MnGa bilayer annealed at 400 C. It was found that the tendency of the Mn and Si elements to make AFM J ex in the Heusler/MnGa bilayers interfaces is larger than that of Fe and Al.",

keywords = "Heusler film, Interfacial exchange coupling, MnGa film",

author = "R. Ranjbar and K. Suzuki and A. Sugihara and Ma, {Q. L.} and Zhang, {X. M.} and Y. Ando and T. Miyazaki and S. Mizukami",

note = "Funding Information: This work was supported in part by ASPIMATT (JST) and the Asahi Glass Foundation . R. R. also thanks Y. Kondo for technical assistance and the WPI program, and acknowledges a JGC-S scholarship (Nikki). Publisher Copyright: {\textcopyright} 2016 Elsevier Ltd.",

year = "2016",

month = apr,

day = "15",

doi = "10.1016/j.matdes.2016.02.047",

language = "English",

volume = "96",

pages = "490--498",

journal = "International Journal of Materials in Engineering Applications",

issn = "0264-1275",

publisher = "Elsevier BV",

}

TY - JOUR

T1 - Structural and magnetic properties of cubic and tetragonal Heusler alloy bilayers

AU - Ranjbar, R.

AU - Suzuki, K.

AU - Sugihara, A.

AU - Ma, Q. L.

AU - Zhang, X. M.

AU - Ando, Y.

AU - Miyazaki, T.

AU - Mizukami, S.

N1 - Funding Information: This work was supported in part by ASPIMATT (JST) and the Asahi Glass Foundation . R. R. also thanks Y. Kondo for technical assistance and the WPI program, and acknowledges a JGC-S scholarship (Nikki). Publisher Copyright: © 2016 Elsevier Ltd.

PY - 2016/4/15

Y1 - 2016/4/15

N2 - Different cubic Co-based Heusler alloys - Co 2FeAl (CFA), Co 2FeSi (CFS), Co 2MnAl (CMA), and Co 2MnSi (CMS) - were grown epitaxially on tetragonal Heusler-like D0 22-MnGa at different annealing temperatures (Ta) in the form of Heusler (20 nm)/MnGa (30 nm) bilayers. The CMA/MnGa bilayer showed the largest critical temperature (450 C), indicating good structural stability against interdiffusion. The experimental results showed an easier interdiffusion of the Fe and Si elements than of Mn and Al. An inverted hysteresis loop was observed in a polar magneto-optical Kerr effect (P-MOKE) measurement for the CFS/MnGa, CMA/MnGa, and CMS/MnGa bilayers. This is one piece of evidence for the existence of the antiferromagnetic (AFM) interfacial exchange coupling (J ex). We evaluated J ex for the Heusler/MnGa bilayers annealed at different temperatures. J ex changed from ferromagnetic (FM) to AFM after annealing at 300 C for the CFA/MnGa bilayer. Other bilayers showed only AFM coupling. The strongest J ex value of approximately -3.2 erg/cm 2 was obtained for the CMS/MnGa bilayer annealed at 400 C. It was found that the tendency of the Mn and Si elements to make AFM J ex in the Heusler/MnGa bilayers interfaces is larger than that of Fe and Al.

AB - Different cubic Co-based Heusler alloys - Co 2FeAl (CFA), Co 2FeSi (CFS), Co 2MnAl (CMA), and Co 2MnSi (CMS) - were grown epitaxially on tetragonal Heusler-like D0 22-MnGa at different annealing temperatures (Ta) in the form of Heusler (20 nm)/MnGa (30 nm) bilayers. The CMA/MnGa bilayer showed the largest critical temperature (450 C), indicating good structural stability against interdiffusion. The experimental results showed an easier interdiffusion of the Fe and Si elements than of Mn and Al. An inverted hysteresis loop was observed in a polar magneto-optical Kerr effect (P-MOKE) measurement for the CFS/MnGa, CMA/MnGa, and CMS/MnGa bilayers. This is one piece of evidence for the existence of the antiferromagnetic (AFM) interfacial exchange coupling (J ex). We evaluated J ex for the Heusler/MnGa bilayers annealed at different temperatures. J ex changed from ferromagnetic (FM) to AFM after annealing at 300 C for the CFA/MnGa bilayer. Other bilayers showed only AFM coupling. The strongest J ex value of approximately -3.2 erg/cm 2 was obtained for the CMS/MnGa bilayer annealed at 400 C. It was found that the tendency of the Mn and Si elements to make AFM J ex in the Heusler/MnGa bilayers interfaces is larger than that of Fe and Al.

KW - Heusler film

KW - Interfacial exchange coupling

KW - MnGa film

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U2 - 10.1016/j.matdes.2016.02.047

DO - 10.1016/j.matdes.2016.02.047

M3 - Article

AN - SCOPUS:84960077935

VL - 96

SP - 490

EP - 498

JO - International Journal of Materials in Engineering Applications

JF - International Journal of Materials in Engineering Applications

SN - 0264-1275

ER -

Structural and magnetic properties of cubic and tetragonal Heusler alloy bilayers

Abstract

Keywords

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