Ultrafast magnetization dynamics in Co-based Heusler compounds with tuned chemical ordering

被引：15

作者：

Steil, D. ^{[1
,2
]}

Schmitt, O. ^{[1
,2
]}

Fetzer, R. ^{[1
,2
]}

Kubota, T. ^{[3
]}

Naganuma, H. ^{[4
]}

Oogane, M. ^{[4
]}

Ando, Y. ^{[4
]}

Suszka, A. K. ^{[5
]}

Idigoras, O. ^{[5
]}

Wolf, G. ^{[1
,2
]}

Hillebrands, B. ^{[1
,2
]}

Berger, A. ^{[5
]}

Aeschlimann, M. ^{[1
,2
]}

Cinchetti, M. ^{[1
,2
]}

机构：

[1] Univ Kaiserslautern, Dept Phys, D-67653 Kaiserslautern, Germany

[2] Univ Kaiserslautern, Res Ctr OPTIMAS, D-67653 Kaiserslautern, Germany

[3] Tohoku Univ, WPI Adv Inst Mat Res, Sendai, Miyagi 9808579, Japan

[4] Tohoku Univ, Grad Sch Engn, Dept Appl Phys, Sendai, Miyagi 9808579, Japan

[5] CIC NanoGUNE Consolider, E-20018 San Sebastian, Spain

来源：

NEW JOURNAL OF PHYSICS | 2014年 / 16卷

关键词：

ultrafast demagnetization; Heusler compounds; halfmetallic materials; spin dynamics; magnetic properties; CURIE-TEMPERATURE; REVERSAL; CO2FESI; MOMENT; METALS;

D O I：

10.1088/1367-2630/16/6/063068

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have studied thin film samples of Co2FeSi and Co2MnSi with different degrees of chemical ordering using the time-resolved magneto-optical Kerr effect to elucidate the influence of defects in the crystal structure on magnetization dynamics. Surprisingly, we find that the presence of defects does not influence the optically induced magnetization dynamics on the ultrashort timescale (some 100 fs). However, we observe a second demagnetization stage with a timescale of tens of picoseconds in Co2MnSi for low chemical ordering; that is, a large number of defects. We interpret this second demagnetization step as originating from scattering of mostly thermalized majority electrons into unoccupied minority defect states.

引用

页数：17

共 62 条

[11] Dynamics of electron-magnon interaction and ultrafast demagnetization in thin iron films
Carpene, E.
Mancini, E.
Dallera, C.
Brenna, M.
Puppin, E.
De Silvestri, S.
[J]. PHYSICAL REVIEW B, 2008, 78 (17):
[12] Femtosecond laser excitation of multiple spin waves and composition dependence of Gilbert damping in full-Heusler Co2Fe1-xMnxAl films
Cheng, Chuyuan
Meng, Kangkang
Li, Shufa
Zhao, Jianhua
Lai, Tianshu
[J]. APPLIED PHYSICS LETTERS, 2013, 103 (23)
[13] Spin-flip processes and ultrafast magnetization dynamics in Co:: Unifying the microscopic and macroscopic view of femtosecond magnetism
Cinchetti, M.
Albaneda, M. Sanchez
Hoffmann, D.
Roth, T.
Wuestenberg, J.-P.
Krauss, M.
Andreyev, O.
Schneider, H. C.
Bauer, M.
Aeschlimann, M.
[J]. PHYSICAL REVIEW LETTERS, 2006, 97 (17)
[14] Eschenlohr A, 2013, NAT MATER, V12, P332, DOI [10.1038/NMAT3546, 10.1038/nmat3546]
[15] Electron-phonon scattering dynamics in ferromagnetic metals and their influence on ultrafast demagnetization processes
Essert, Sven
Schneider, Hans Christian
[J]. PHYSICAL REVIEW B, 2011, 84 (22)
[16] Electron theory of fast and ultrafast dissipative magnetization dynamics
Faehnle, M.
Illg, C.
[J]. JOURNAL OF PHYSICS-CONDENSED MATTER, 2011, 23 (49)
[17] Simple rules for the understanding of Heusler compounds
Graf, Tanja
Felser, Claudia
Parkin, Stuart S. P.
[J]. PROGRESS IN SOLID STATE CHEMISTRY, 2011, 39 (01) : 1 - 50
[18] Direct observation of half-metallicity in the Heusler compound Co2MnSi
Jourdan, M.
Minar, J.
Braun, J.
Kronenberg, A.
Chadov, S.
Balke, B.
Gloskovskii, A.
Kolbe, M.
Elmers, H. J.
Schoenhense, G.
Ebert, H.
Felser, C.
Klaeui, M.
[J]. NATURE COMMUNICATIONS, 2014, 5
[19] Magnetic properties of Co2Mn1-xFexSi Heusler alloys
Kallmayer, M
Elmers, HJ
Balke, B
Wurmehl, S
Emmerling, F
Fecher, GH
Felser, C
[J]. JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2006, 39 (05) : 786 - 792
[20] Spin-dependent lifetimes and nondegenerate spin-orbit driven hybridization points in Heusler compounds
Kaltenborn, Steffen
Schneider, Hans Christian
[J]. PHYSICAL REVIEW B, 2014, 89 (11)

← 1 2 3 4 5 6 7 →