Magnetic Properties of Single-Crystalline FeRh Alloy Thin Films

Inoue, Sho; Ko, Hnin Yu Yu; Suzuki, Takao

doi:10.1109/tmag.2008.2001846

Cited by 28 publications

(13 citation statements)

References 9 publications

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“…The stable roomtemperature FM state at the top interface could be accounted for by a mixed phase where different compositions of ␣Ј and/or ␥ phase FeRh coexist giving rise to a wide range of transition temperatures some of which are below room temperature. 11,26 This deviation from the nominal stoichiometry is consistent with our x-ray and neutron-reflectivity results at the cap/FeRh interface where a change in the structural depth profile near the top 100 Å of the interface was observed. This reduction in the structural SLD suggests an Fe-deficient ͑Rh-rich͒ layer near the top interface is formed.…”

Section: Discussionsupporting

confidence: 89%

Ferromagnetism at the interfaces of antiferromagnetic FeRh epilayers

et al. 2010

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. The nanoscale magnetic structure of FeRh epilayers has been studied by polarized neutron reflectometry. Epitaxial films with a nominal thickness of 500 Å were grown on MgO ͑001͒ substrates via molecular-beam epitaxy and capped with 20 Å of MgO. The FeRh films show a clear transition from the antiferromagnetic ͑AF͒ state to the ferromagnetic ͑FM͒ state with increasing temperature. Surprisingly the films possess a FM moment even at a temperature 80 K below the AF-FM transition temperature of the film. We have quantified the magnitude and spatial extent of this FM moment, which is confined to within ϳ60-80 Å of the FeRh near the top and bottom interfaces. These interfacial FM layers account for the unusual effects previously observed in films with thickness Ͻ100 Å. Given the delicate energy balance between the AF and FM ground states we suggest a metastable FM state resides near to the interface within an AF matrix. The length scale over which the FM region resides is consistent with the strained regions of the film.

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Section: Discussionsupporting

confidence: 89%

Ferromagnetism at the interfaces of antiferromagnetic FeRh epilayers

et al. 2010

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“…The magnitude of the saturation magnetization is slightly lower as compared to a Fe 0.5 Rh 0.5 film for example from Ref. [14] which would indicate a slightly higher Rh content in our film. For the simulation of the FMR spectrum including the asymmetry it is sufficient to additionally assume a thin interface/surface layer with a low saturation magnetization of 380 emu cm À3 and a thickness of only 1.5 nm.…”

Section: Originalmentioning

confidence: 57%

Ferromagnetic resonance of MBE-grown FeRh thin films through the metamagnetic phase transition

Heidarian

Stienen

Семисалова

et al. 2017

Phys. Status Solidi B

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An FeRh thin film of 33 nm thickness grown by molecular beam epitaxy (MBE) has been investigated with respect to its temperature dependent magnetic properties by means of ferromagnetic resonance (FMR). Within the ferromagnetic regime, that is at temperatures above the antiferromagnetic‐to‐ferromagnetic phase transition, the resonance field decreases with decreasing temperature reflecting an increasing magnetization. Within the temperature regime of the phase transition, the resonance field behaves non‐monotonically, that is it suddenly increases with decreasing temperature. The observed asymmetric shape of the FMR absorption line is discussed with respect to a possible small magnetic inhomogeneity of the film coupled to the main ferromagnetic volume of B2 ordered, equiatomic FeRh.

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“…A similar phenomenon has been observed in previous experiments. 39,40 Instead, the THz signal amplitude rather seems to follow the cooling branch of the SQUID hysteresis with indications of a small hysteretic behavior at the kink regions (around 270 and 310 K).…”

Section: Ferhmentioning

confidence: 97%

Terahertz Spin Currents and Inverse Spin Hall Effect in Thin-Film Heterostructures Containing Complex Magnetic Compounds

Seifert

Martens

Günther

et al. 2017

SPIN

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Terahertz emission spectroscopy (TES) of ultrathin multilayers of magnetic and heavy metals has recently attracted much interest. This method not only provides fundamental insights into photoinduced spin transport and spin-orbit interaction at highest frequencies, but has also paved the way for applications such as e±cient and ultrabroadband emitters of terahertz (THz) electromagnetic radiation. So far, predominantly standard ferromagnetic materials have been exploited. Here, by introducing a suitable¯gure of merit, we systematically compare the strength of THz emission from X/Pt bilayers with X being a complex ferro-, ferri-and antiferromagnetic metal, that is, dysprosium cobalt (DyCo 5 ), gadolinium iron (Gd 24 Fe 76 ), magnetite (Fe 3 O 4 ) and iron rhodium (FeRh). We¯nd that the performance in terms of spin-current generation not only depends on the spin polarization of the magnet's conduction electrons, but also on the speci¯c interface conditions, thereby suggesting TES to be a highly interface-sensitive technique. In general, our results are relevant for all applications that rely on the optical generation of ultrafast spin currents in spintronic metallic multilayers.

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Magnetic Properties of Single-Crystalline FeRh Alloy Thin Films

Cited by 28 publications

References 9 publications

Ferromagnetism at the interfaces of antiferromagnetic FeRh epilayers

Ferromagnetism at the interfaces of antiferromagnetic FeRh epilayers

Ferromagnetic resonance of MBE-grown FeRh thin films through the metamagnetic phase transition

Terahertz Spin Currents and Inverse Spin Hall Effect in Thin-Film Heterostructures Containing Complex Magnetic Compounds

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