Induced spin polarization in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">V</mml:mi><mml:mo>:</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow><mml:mi>n</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">V</mml:mi></mml:mrow><mml:mrow><mml:mi>m</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superlattices and thin V films on Fe substrates

Izquierdo, J.L.; Vega, A.; Elmouhssine, O.; Dreyssé, H.; Demangeat, C.

doi:10.1103/physrevb.59.14510

Cited by 42 publications

(47 citation statements)

References 36 publications

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“…The result showed that the magnetic moment of the Fe layer did not change when the measuring temperature was changed from 300 K to 2 K. It means for this kind of samples the size effect at room temperature is so small that its influence could be omitted when T was changed from 300 K to 2 K. Thus a conclusion can be derived that in the present work the reduction of -1.5(±0.1) µ B mentioned above is mainly due to the contribution of the two Fe/V interfaces. Assuming that both interfaces are equal, well then, the reduction of the magnetic moment at each Fe/V interface is -0.75(±0.05) µ B (about 35% compared with the Fe bulk value), which is in agreement with the theoretical calculations [Ham84,Izq99] and the experimental results [Hos84,Tom97,Wal94]. However, the PNR data cannot distinguish between an antiparallel alignment of the V atoms or a reduced magnetic moment of the interfacial Fe layer.…”

Section: Figure 412 (A) the Influence Of The Roughness Of The Vanadisupporting

confidence: 80%

“…Assuming that both interfaces are equal, then the reduction of the magnetic moment at each Fe/V interface is -0.75(±0.05) µ B (about 35% compared with the Fe bulk value). This value is well in agreement with the theoretical calculations [Ham84,Izq99]. Moreover, a strong deviation from the fit line was found for the data point of the sample with an Fe thick-ness of 0.3 nm.…”

Section: Chapter 6 Summarysupporting

confidence: 80%

“…An increase in the magnetization at the Fe surface was predicted by theories [Fre85,Fu85,Sto95,Veg95] and was proven by experiments [Elm89,Tam90]. A reduction in the magnetization at the Fe/V interface was predicted by theories [Coe95,Spi00,Izq99] and was proven by experiments [Dud96,Gra98,Pou97,Tom97]. That means the magnetization of the free Fe surface is different from that of the Fe/V(100) interface.…”

Section: Disscussionmentioning

confidence: 78%

“…The first, from this work it is demonstrated that it is possible to separate the magnetic contributions from the surface and the interface of a thin film by combining the ex-situ PNR with in-situ PNR, but a high intensity neutron source is required to improve the sensitivity; the second, since the two different techniques, both in-situ MOKE and in-situ PNR, show similar results, we can argue that the magnetic enhancement by +0.3µ B at the free Fe surface is more probable. [Izq99] the reduction of the magnetic moment, caused by the induced antiparallel V magnetic moment, should be larger at the Fe/V(100) interface than at the Fe/V(110) interface. The reason is that V has more Fe nearest neighbors at the (100) interface than at the (110) interface.…”

Section: Discussionmentioning

confidence: 99%

“…But this can not be used to explain the different values. From the theoretical calculations [Izq99] it is expected that the reduced magnetization at the interface of Fe/V(110) is smaller than that at the Fe/V(100) interface. A detailed explanation will be given in the following paragraph in combination with the in-situ PNR results.…”

Section: Disscussionmentioning

confidence: 99%

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Polarized neutron reflectometry study of thin Fe films prepared on V (100)

Liu

Fritzsche

Hauschild

et al. 2004

Physica B: Condensed Matter

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The present work emphasizes on the polarized neutron reflectometry (PNR) method as a powerful tool to study details of the magnetization of an ultrathin film by combining in-situ and ex-situ PNR measurements as function of the film thickness for the first time. The aim is to separate and estimate the magnetization contributions from the interface, the inner part and the free surface of the film by investigating capped and uncapped films.A series of samples of V / t Fe Fe / V(100) and t Fe Fe / V(100) all grown on MgO (100) substrates with different Fe thickness t Fe were prepared by molecular beam epitaxy (MBE).The critical part of the preparation of the Fe/V samples was the preparation of a chemically clean Vanadium substrate layer with a good crystalline quality. Instead of using a V single crystal substrate, V was evaporated on a MgO(100) substrate together with an additional ultrathin V toplayer by MBE with various heat treatments. This procedure was successful leading to a smooth and clean V(100) surface with good crystalline quality. Concerning the samples for the ex-situ measurements it was established with the help of x-ray reflectometry (XRR) that V 2 O 3 was formed on top of the V capping layer after the samples were exposed to air. The oxidation, however, did not penetrate as deep as to reach the Fe/V interface which would have influenced the Fe magnetization.The samples were studied using ex-situ PNR, ex-situ XRR, in-situ PNR, and in-situ magneto-optical Kerr effect (MOKE). The ex-situ measurements were done on V-capped samples, while uncapped Fe films were used in the in-situ measurements. According to the results obtained the product of the magnetic moment per atom and the Fe thickness of ultrathin Fe(100) films was plotted as a function of the Fe thickness. Analyzing these plots the different contributions to the magnetization were estimated. The slope of this kind of plot is correlated with the magnetization from the inner part of the Fe layer. On the other hand, the intersection at the abscissa may help to separate the contributions from the interface and free surface.All the PNR data are consistent with the concept of a linear superposition of a volume and a surface term for describing the magnetization of a thin film, where the volume term grows linearly with the thickness. The experiments clearly indicate that the capping of the thin Fe film with V changes the total magnetization, whereas it does not affect the magnetic moment of the inner part of the Fe layer (which is that of bulk Fe). Combining both series of PNR experiments demonstrates the existence of a reduced magnetic moment at the Fe/V interface, estimated to be a reduction of -0.75(±0.05) µ B /atom which corresponds to about 35% of the Fe bulk value. In contrast, an enhanced magnetic moment at the free Fe surface is derived (estimated to be an enhancement of +0.3(±0.9) µ B /atom). (100) durch MBE-Epitaxie aufgedampft und unter verschiedenen Behandlungen schließlich mit einer ultradünnen V-Schicht abgedeckt. Diese Prozedur w...

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Section: Figure 412 (A) the Influence Of The Roughness Of The Vanadisupporting

confidence: 80%

Section: Chapter 6 Summarysupporting

confidence: 80%

Section: Disscussionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 99%

Section: Disscussionmentioning

confidence: 99%

See 3 more Smart Citations

Polarized neutron reflectometry study of thin Fe films prepared on V (100)

Liu

Fritzsche

Hauschild

et al. 2004

Physica B: Condensed Matter

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Direct Probe of Induced Magnetic Moments at Interfaces via X-Ray Magnetic Circular Dichroism

Poulopoulos

Scherz

Wilhelm

et al. 2002

phys. stat. sol. (a)

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Recent progress in X-ray magnetic circular dichroism allows us to probe induced magnetism with element specificity and monolayer sensitivity. Here, we demonstrate magnetic polarization of the 5d elements Pt, Ir and W and the 3d V at the interfaces with the 3d ferromagnets Ni and Fe. Pt and Ir are shown to be ferro-while W and V anti-ferromagnetically coupled to Ni or Fe. Spin, orbital and total magnetic moments are obtained and trends in the magnetism of the 5d elements are deduced. Monolayer-resolved magnetic moment profiles for the whole multilayer period for Ni and Pt are shown and compared to ab initio calculations. Finally, we deal with the problem of polarization of V at the interface with Fe and discuss the necessity of performing controllable growth and in situ measurements for a basic understanding of the induced interface magnetism.

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Orientation effects on the magnetic properties of a pair Cr₆ and V₆ atomic clusters embedded in bulk Fe

Alvarado-Leyva¹,

Dorantes-Dávila

2003

Physica Status Solidi (b)

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The magnetic and electronic properties of a pair Cr 6 and V 6 atomic clusters embedded in bulk Fe are determined by using a realistic spd-band Hubbard-like model. The spin density distribution is calculated self-consistently in the unrestricted Hartree-Fock approximation. The local magnetic moments mðiÞ and the density of electronic states q i ðeÞ are obtained at various atoms i of the cluster and of the surrounding Fe matrix. We consider two different orientations between the clusters, or better still the axis of symmetry of the clusters: collinear (C) and non-collinear (NC). For all the cases studied the interface magnetic coupling between cluster and matrix moments is antiparallel. The Fe moments close to the cluster are slighty reduced, and the mðiÞ of Cr and V atoms at the interface are often much larger than the Cr bulk moments (e.g. mðiÞ ¼ À1:39m B for Cr 6 in Fe in both orientations). We compare the results with the corresponding results for just one Cr 6 and V 6 atomic cluster embedded in bulk Fe.

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Induced spin polarization inV:FenVmsuperlattices and thin V films on Fe substrates

Cited by 42 publications

References 36 publications

Polarized neutron reflectometry study of thin Fe films prepared on V (100)

Polarized neutron reflectometry study of thin Fe films prepared on V (100)

Direct Probe of Induced Magnetic Moments at Interfaces via X-Ray Magnetic Circular Dichroism

Orientation effects on the magnetic properties of a pair Cr₆ and V₆ atomic clusters embedded in bulk Fe

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Induced spin polarization inV:FenVmsuperlattices and thin V films on Fe substrates

Cited by 42 publications

References 36 publications

Polarized neutron reflectometry study of thin Fe films prepared on V (100)

Polarized neutron reflectometry study of thin Fe films prepared on V (100)

Direct Probe of Induced Magnetic Moments at Interfaces via X-Ray Magnetic Circular Dichroism

Orientation effects on the magnetic properties of a pair Cr6 and V6 atomic clusters embedded in bulk Fe

Contact Info

Product

Resources

About

Orientation effects on the magnetic properties of a pair Cr₆ and V₆ atomic clusters embedded in bulk Fe