Charge Long-range magnetic order Implemented by Coupling Xavier Marti,...

Charge Long-range magnetic order

Implemented by Coupling

Xavier Marti, [email protected]://usuaris.tinet.cat/xmarti/talks

1. Metals: AMR,GMR2. Semiconductors3. Insulators

Standard substratesRoom temperature

Grown on

Boston Feb2012

Institute of Physics (Prague) – University Nottingham COBRA Inter-University Eindhoven -ORNL

mailto:[email protected]

DopingTemperature


GaAs

Ga

As

(Ga,Mn)As

Ga

As

Mn

MnAs

FerromagneticSemiconductor


III-V FM TC (K) AFM TN (K)FeN 100FeP 115FeAs 77FeSb 100-220GdN 72GdP 15GdAs 19GdSb 27

II-VI FM TC (K) AFM TN (K)MnO 122MnS 152MnSe 173MnTe 323EuO 67EuS 16EuSe 5EuTe 10


Intrinsic III-V and II-VI semiconductors

Maca et al., JMMM 324, 1606 (2012)


Large SOC Large momentLarge moment


Schick et al., PRB 81, 212409 (2010)





Schick et al., PRB 81, 212409 (2010)


T15 Room 213

Helena Reichlova




Schick et al., PRB 81, 212409 (2010)



Crystal and magnetic structure: Bronger et al, Z. anorg. allg. Chem. 539, 175 (1986)

THEORYSemiconductor with huge spin-orbit coupling

GAP



InAs

4.27A

4.28A

THIN FILM EPILAYERS

V. Novak, et al., J. Cryst. Growth 323, 348 (2011)

log(

inte

nsit

y)

InAs

4.27A

4.28A

THIN FILM EPILAYERS

LiMnAs has a bandgap

InAs

Li MnAs

4.27A

4.28A

I. Wijnheijmer et al, Appl. Phys. Lett. In press

dI/dV map

Is LiMnAs the only choice available?




V. M. Ryzhkovsky, et al., Inorg. Mater. 32 117 (1995)

A.E. Austin, et al.,J. Appl. Phys. 33 1356 (1962)

TNRT



[110]

[110]_

CuMnAs grown on GaAs


0 0.1 0.2 0.3 0.4 0.5 0.6 0.70

1

2

3

4

5x 10

6

Qz (A

-1)

Out-of-plane param (A):6.2933

Qx (A

-1)

Qy (

A-1

)

Spectra of in-plane periodicities in the substrate

-0.5 0 0.5-0.6

-0.4

-0.2

0

0.2

0.4

0.6

Qx (A

-1)

Qy (

A-1

)

Spectra of in-plane periodicities in the thin film

-0.5 0 0.5-0.6

-0.4

-0.2

0

0.2

0.4

0.6

GaAs

CuMnAs



0 0.1 0.2 0.3 0.4 0.5 0.6 0.70

1

2

3

4

5x 10

6

Qz (A

-1)

Out-of-plane param (A):6.2933

Qx (A

-1)

Qy (

A-1 )

Spectra of in-plane periodicities in the substrate

-0.5 0 0.5-0.6

-0.4

-0.2

0

0.2

0.4

0.6

Qx (A

-1)

Qy (

A-1 )

Spectra of in-plane periodicities in the thin film

-0.5 0 0.5-0.6

-0.4

-0.2

0

0.2

0.4

0.6

GaAs

CuMnAs

L=1 L=2 L=3

ab

c

a = b = 5.407 Åc = 6.313 Å

GaAs, a = 5.65 Å



TEM: Jaume Gazquez, Oak Ridge NL

Growth: R. Campion, Nottingham



TEM: Jaume Gazquez, Oak Ridge NL

Growth: R. Campion, Nottingham

GaAs

CuMnAs



GaAs

Fe 10 nm

(c)

[001](e)

300 K


GaAs

CuMnAs

Fe


(c)

[001](e)

300 K

Fe/CuMnAs exchange bias


GaAs

CuMnAs

Fe



(c)

[001](e)

GAP

300 K

Fe/CuMnAs exchange bias



Prague : P. Wadley, H. Reichlova, M. Cukr, F. Maca, A.B. Shick, J. Masek, P. Horodyska, P. Nemec, V. Holy, J. Zemen, P. Kuzel, I. Nemec, K. Olejnik, J. Wunderlich, O. Stelmakhovych, K. Ulrihova, P. Beran, V. Novak, T. JungwirthNottingham : R. Campion, K. Edmonds, B. Gallagher, C.T. FoxonEindhoven : I. Wijnheijmer, P. KoenraadORNL: J. Gazquez, M. Varela

Charge Long-range magnetic order

Implemented by Coupling

1. Metals: AMR,GMR2. Semiconductors3. Insulators

Standard substratesRoom temperature

Grown on

Thanks for your attention

LiMnAsCuMnAs


Charge Long-range magnetic order Implemented by Coupling Xavier Marti,...

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