The spin texture in Fe/Tb multilayers

Scholz, Bernhard; Brand, R. A.; Keune, W.

doi:10.1007/bf02396522

Cited by 24 publications

(12 citation statements)

References 3 publications

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“…From the line-intensity ratio a half-cone angle Θ of 37 • (= Φ) is obtained at remanence, i.e. the average Fe-spin orientation is out-of-plane, in qualitative agreement with literature reports [8,14]. The out-of-plane orientation observed in the center of the bcc-Fe layers is at variance with model calculations where in-plane Fe moments are assumed [15].…”

supporting

confidence: 87%

“…The latter is not unreasonable, since one Tb atomic layer with ∼ 9.3µ B /Tb-atom can effectively compensate the moment of ∼ 4.5 Fe atomic layers with ∼ 2µ B /Fe-atom, and only ∼ 1-1.5 Tb atomic layers are needed for compensation. We may exclude zero Fe moments at 5 K , since a non-magnetic central peak in Mössbauer spectra of similar multilayers with homogeneous bcc-57 Fe layers was not observed at 5 K [14].…”

mentioning

confidence: 99%

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Atomistic observation of magnetization along a hysteresis loop in terbium/iron multilayers with perpendicular magnetic anisotropy inferred from site-selective ⁵⁷ Fe-Mössbauer spectroscopy

Tappert¹,

Neumann²,

Brand³

et al. 1999

Europhys. Lett.

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Iron-site selective 57 Fe-Mössbauer spectra in external fields perpendicular to the layers were measured along the magnetization-hysteresis loop in a hcp-Tb/bcc-Fe multilayer with out-of-plane magnetic orientation and large coercivity. In the multidomain region, two oppositely and out-of-plane magnetized domain states in the Fe layers are distinguished in the spectra. The Fe-spin direction was found to be at oblique angles with respect to the surface normal (and Bext direction), reminiscent of a cone state. Fe-spin rotation was directly observed along the hysteresis loop, and the bcc-Fe-specific magnetization loop was calculated from the Mössbauer results.

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supporting

confidence: 87%

mentioning

confidence: 99%

Atomistic observation of magnetization along a hysteresis loop in terbium/iron multilayers with perpendicular magnetic anisotropy inferred from site-selective ⁵⁷ Fe-Mössbauer spectroscopy

Tappert¹,

Neumann²,

Brand³

et al. 1999

Europhys. Lett.

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“…Ref. 24,25. Actually, the 5 d states of the rare-earth owe their ferromagnetism to the polarization by the 4f states.…”

Section: Resultsmentioning

confidence: 99%

Direct evidence for significant spin-polarization of EuS in Co/EuS multilayers at room temperature

Pappas

Poulopoulos

Lewitz

et al. 2013

Sci Rep

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The new era of spintronics promises the development of nanodevices, where the electron spin will be used to store information and charge currents will be replaced by spin currents. For this, ferromagnetic semiconductors at room temperature are needed. We report on significant room-temperature spin polarization of EuS in Co/EuS multilayers recorded by x-ray magnetic circular dichroism (XMCD). The films were found to contain a mixture of divalent and trivalent europium, but only Eu++ is responsible for the ferromagnetic behavior of EuS. The magnetic XMCD signal of Eu at room temperature could unambiguously be assigned to magnetic ordering of EuS and was found to be only one order of magnitude smaller than that at 2.5 K. The room temperature magnetic moment of EuS is as large as the one of bulk ferromagnetic Ni. Our findings pave the path for fabrication of room–temperature spintronic devices using spin polarized EuS layers.

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“…14,15 In our calculations we used the magnetization values of 3d and EuS of our measurements and allowed them to vary within 10%. Besides the use of a direct bilinear antiferromagnetic exchange coupling, which is known to hold between 3d and 4f magnetic atoms, 26,27 we used a biquadratic coupling in order to have best fit of the experimental data. As origin of it could be the non-collinearities of the magnetic moments at the interfaces due to roughness, similar, for example, to the cases of directly coupled exchange biased systems or interlayer exchange coupling.…”

Section: Resultsmentioning

confidence: 99%

PROXIMITY EFFECTS AND CURIE TEMPERATURE ENHANCEMENT IN Co/EuS AND Fe/EuS MULTILAYERS

Lewitz

Straub

Kapaklis

et al. 2012

SPIN

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Two identical Co/EuS and Fe/EuS multilayers of six periods each and with individual layers of about 4 nm thick are grown by e-beam evaporation under ultrahigh vacuum conditions. The films show polycrystalline structure with a grain size limited by the individual layer thickness. Both multilayers consist of almost continuous layers with some roughness. The surface peak-to-peak roughness is about 4–5 nm. Magnetization measurements and calculations of the loops based on a Stoner–Wohlfarth-like model allow us to determine the direct antiferromagnetic exchange coupling constant between the 3d metal and EuS at 5 K. Both samples show strong enhancement of the Curie temperature of EuS up to at least 50 K with a EuS magnetization tail, which persists up to about 100 K. The J = 7/2 character of the EuS layers is shown to be responsible for the large Curie temperature enhancement.

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The spin texture in Fe/Tb multilayers

Cited by 24 publications

References 3 publications

Atomistic observation of magnetization along a hysteresis loop in terbium/iron multilayers with perpendicular magnetic anisotropy inferred from site-selective ⁵⁷ Fe-Mössbauer spectroscopy

Atomistic observation of magnetization along a hysteresis loop in terbium/iron multilayers with perpendicular magnetic anisotropy inferred from site-selective ⁵⁷ Fe-Mössbauer spectroscopy

Direct evidence for significant spin-polarization of EuS in Co/EuS multilayers at room temperature

PROXIMITY EFFECTS AND CURIE TEMPERATURE ENHANCEMENT IN Co/EuS AND Fe/EuS MULTILAYERS

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The spin texture in Fe/Tb multilayers

Cited by 24 publications

References 3 publications

Atomistic observation of magnetization along a hysteresis loop in terbium/iron multilayers with perpendicular magnetic anisotropy inferred from site-selective 57 Fe-Mössbauer spectroscopy

Atomistic observation of magnetization along a hysteresis loop in terbium/iron multilayers with perpendicular magnetic anisotropy inferred from site-selective 57 Fe-Mössbauer spectroscopy

Direct evidence for significant spin-polarization of EuS in Co/EuS multilayers at room temperature

PROXIMITY EFFECTS AND CURIE TEMPERATURE ENHANCEMENT IN Co/EuS AND Fe/EuS MULTILAYERS

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Atomistic observation of magnetization along a hysteresis loop in terbium/iron multilayers with perpendicular magnetic anisotropy inferred from site-selective ⁵⁷ Fe-Mössbauer spectroscopy

Atomistic observation of magnetization along a hysteresis loop in terbium/iron multilayers with perpendicular magnetic anisotropy inferred from site-selective ⁵⁷ Fe-Mössbauer spectroscopy