Fe spin structure in Tb/Fe multilayers

Tappert, J.; Neumann, Siegfried; Jungermann, J.; Kim, W. S.; Ruckert, T.; Brand, R. A.; Keune, W.; Kleemann, W.; Richomme, F.; Teillet, J.; Klose, F.; Maletta, H.

doi:10.1080/13642810008208614

Cited by 12 publications

(12 citation statements)

References 39 publications

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“…The high perpendicular remanence indicates that nearly a single-domain state exists at H = 0 Oe. Our finding of perpendicular magnetic anisotropy in Tb/bcc-Fe multilayers is in agreement with earlier reports [7][8][9]. However, our observation of a high perpendicular remanence at RT in such multilayers is a new result.…”

Section: Experimental Procedures and Sample Characterizationsupporting

confidence: 94%

“…5 shows the CEMS spectra (measured at RT (a) and 80 K (b)) of the Fe/Tb multilayer on GaAs(001)-LED, which includes the 5 ML thick 57 Fe tracer layer in the center of the first 2.6 nm thick (epitaxial) Fe(001) film on the GaAs surface. In agreement with literature reports [7][8][9], these spectra could be least-squares fitted with two spectral components. Subspectrum (1) is a dominant Zeeman-split sextet with relatively sharp lines originating from 57 Fe atoms in bulk-like bcc-Fe local surroundings; it was fitted with a narrow Gaussian distribution of hyperfine magnetic fields, P(B hf ).…”

Section: Experimental Procedures and Sample Characterizationsupporting

confidence: 78%

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Preparation and characterization of epitaxial Fe(001) thin films on GaAs(001)-based LED for spin injection

Schuster

Keune

et al. 2005

Superlattices and Microstructures

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Section: Experimental Procedures and Sample Characterizationsupporting

confidence: 94%

Section: Experimental Procedures and Sample Characterizationsupporting

confidence: 78%

Preparation and characterization of epitaxial Fe(001) thin films on GaAs(001)-based LED for spin injection

Schuster

Keune

et al. 2005

Superlattices and Microstructures

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“…The PMA is conceived to be caused by antiferromagnetically exchange-coupled Fe-Tb atomic pairs combined with singleion anisotropy and the large orbital moment of the Tb ion [123][124][125]. An ultrathin amorphous Fe-Tb alloy phase at the Fe/Tb interface (a few atomic layers thick), as observed by Mössbauer spectroscopy [116][117][118][119][120][121], is also involved in creating PMA. Figure 19 shows CEM spectra taken at RT (top) and 80 K (bottom) from a GaAs(001)-based LED (with an InGaAs quantum well) carrying a Tb/Fe-multilayer electrode and a 5-ML-thick 57 Fe(001) probe layer at the interface .…”

Section: Ferromagnet/semiconductor Heterostructures: Fe On Gaas(001)mentioning

confidence: 99%

“…[109,110]. It is well known that bcc-Fe layers in nanoscale Fe/Tb multilayers exibit PMA [26,[116][117][118][119][120][121][122][123][124][125] due to interface anisotropy. The PMA is conceived to be caused by antiferromagnetically exchange-coupled Fe-Tb atomic pairs combined with singleion anisotropy and the large orbital moment of the Tb ion [123][124][125].…”

Section: Ferromagnet/semiconductor Heterostructures: Fe On Gaas(001)mentioning

confidence: 99%

Application of Mössbauer spectroscopy in magnetism

Keune

2012

Hyperfine Interact

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An overview is provided on our recent work that applies 57 Fe Mössbauer spectroscopy to specific problems in nanomagnetism. 57 Fe conversion electron Möss-bauer spectroscopy (CEMS) in conjunction with the 57 Fe probe layer technique as well as 57 Fe nuclear resonant scattering (NRS) were employed for the study of various nanoscale layered systems: (i) metastable fct-Fe; a strongly enhanced hyperfine magnetic field B hf of ∼39 T at 25 K was observed in ultrahigh vacuum (UHV) on uncoated three-monolayers thick epitaxial face-centered tetragonal (fct) 57 Fe(110) ultrathin films grown by molecular-beam epitaxy (MBE) on vicinal Pd(110) substrates; this indicates the presence of enhanced Fe local moments, μ Fe , as predicted theoretically; (ii) Fe spin structure; by applying magnetic fields, the Fe spin structure during magnetization reversal in layered (Sm-Co)/Fe exchange spring magnets and in exchange-biased Fe/MnF 2 bilayers was proven to be non-collinear and depth-dependent; (iii) ferromagnet/semiconductor interfaces for electrical spin injection; CEMS was used as a diagnostic tool for the investigation of magnetism at the buried interface of Fe electrical contacts on the clean surface of GaAs(001) and GaAs(001)-based spin light-emitting diodes (spin LED) with in-plane or out-ofplane Fe spin orientation; the measured rather large average hyperfine field of ∼27 T at 295 K and the distribution of hyperfine magnetic fields, P(B hf ), provide evidence for the absence of magnetically "dead" layers and the existence of relatively large Fe moments (μ Fe ∼ 1.8 μ B ) at the ferromagnet/semiconductor interface. -Finally, a short outlook is given for potential applications of Mössbauer spectroscopy on topical subjects of nanomagnetism/spintronics.

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“…The PMA induced by the antiferromagnetically coupled Fe/Tb interfaces competes with the magnetic dipolar interaction ('shape anisotropy') [3][4][5], which orients the magnetization of most conventional ferromagnetic thin films into the film plane. An integration of ferromagnetic materials with PMA and semiconductors in hybrid systems opens promising perspectives for novel devices, e.g., in the field of semiconductor (SC) based spin electronics.…”

mentioning

confidence: 99%

Fe/Tb multilayer ferromagnets for local semiconductor spin control

Halm

Neshataeva

Seifert

et al. 2006

Phys. Status Solidi (c)

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We investigated a hybrid structure consisting of microstructured Fe/Tb multilayer ferromagnets (FMs) and a ZnCdMnSe dilute magnetic semiconductor quantum well (DMS QW) by means of superconducting quantum interference device (SQUID) magnetometry and micro-photoluminescence (µPL) spectroscopy. The Fe/Tb multilayers show a strong perpendicular magnetic anisotropy (PMA) with a temperature dependent coercive field H c reaching values of 2.5 T /µ0 at 4 K. The out-of-plane magnetic fringe field stemming from the Fe/Tb microstructures induces a locally varying magnetization in the underlying DMS QW, which polarizes the spins of optically excited charge carriers in the DMS. We demonstrate that the coupling between these magnetic systems enables us to control the local carrier spin polarization in the DMS via the magnetization of microscale Fe/Tb ferromagnetic wires.

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Fe spin structure in Tb/Fe multilayers

Cited by 12 publications

References 39 publications

Preparation and characterization of epitaxial Fe(001) thin films on GaAs(001)-based LED for spin injection

Preparation and characterization of epitaxial Fe(001) thin films on GaAs(001)-based LED for spin injection

Application of Mössbauer spectroscopy in magnetism

Fe/Tb multilayer ferromagnets for local semiconductor spin control

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