Identifying growth mechanisms for laser-induced magnetization in FeRh

Bergman, Bastiaan; Ju, Ganping; Hohlfeld, J.; Veerdonk, R.J.M. van de; Kim, Jai-Young; Wu, Xiaowei; Weller, D.; Koopmans, B.

doi:10.1103/physrevb.73.060407

Cited by 46 publications

(50 citation statements)

References 13 publications

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“…As PNR averages over the in-plane magnetic induction of the sample the result is a reduced in-plane magnetization as observed. This description is consistent with a nonhomogeneous metamagnetic bulk transition 34,35 for FeRh. The stabilization of the room-temperature FM phase from surface states is appealing but does not satisfactorily account for the long length scale observed for the net polarization.…”

Section: Discussionsupporting

confidence: 68%

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: 68%

Ferromagnetism at the interfaces of antiferromagnetic FeRh epilayers

et al. 2010

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“…1-10͒ as well as its potential applications to data storage media and microelectromechanical devices. 11,12 Although many attempts have been made in order to elucidate the underlying mechanism of the magnetic phase transition, the local origin responsible for the nucleation of ferromagnetism is still under debate, 13 in particular, in thin films because stress at the film/substrate interface strongly affects the magnetic properties such as the magnetic transition temperature and the steepness of the transition. 10 Recently, a theoretical calculation provided a possible mechanism of the stabilization of the FM state in a thin film within density functional formalism and demonstrated that a decrease in the film thickness leads to a transition from AF to FM states due to its surface effect.…”

Section: Introductionmentioning

confidence: 99%

Stability of ferromagnetic state of epitaxially grown ordered FeRh thin films

Suzuki

Koike

Itoh

et al. 2009

Journal of Applied Physics

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We report on the magnetic properties of B2-type ordered FeRh epitaxial thin films deposited on MgO͑001͒ substarates as a function of film thickness. All the films show a clear magnetic phase transition from the antiferromagnetic state to the ferromagnetic state with increasing temperature while the transition temperature of a 10-nm-thick film decreases down to 300 K. The 10-nm-thick film also shows a large magnetization even in the antiferromagnetic state compared with other thicker films. These magnetization data indicate that the ferromagnetic state is becoming more stable than the antiferromagnetic state with decreasing film thickness. Such thickness dependent magnetic properties are qualitatively compatible with a theoretical prediction for FeRh͑001͒ thin layers.

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“…At higher temperatures the material becomes paramagnetic ͑PM͒ around T c = 680 K. Both temperatures are sensitive to the exact composition of the sample and can be tuned by doping. 12 Recently, two groups independently [13][14][15] have studied the generation of FM order in the FeRh alloy by means of timeresolved magneto-optical Kerr effect ͑TR-MOKE͒. It has been shown, that generating magnetization in FeRh may be considerably faster than the re-establishment of FM order in ordinary ferromagnetic metals when cooling down from the PM state.…”

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confidence: 99%

Laser-induced generation and quenching of magnetization on FeRh studied with time-resolved x-ray magnetic circular dichroism

et al. 2010

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Ultrafast magnetization dynamics triggered by femtosecond laser excitation of the FeRh alloy is investigated by time-resolved x-ray magnetic circular dichroism. We measure a gradual growth of magnetization within Ϸ100 ps for both Fe and Rh elements as the system is laser-driven through its first-order magnetic phase transition from the antiferromagnetic ͑AFM͒ to the ferromagnetic ͑FM͒ state. A dynamic AFM-FM phase coexistence is observed, identifying the magnetization growth mechanism as the rapid nucleation and subsequent slow expansion of FM regions within an AFM matrix. In contrast to the magnetization generation process, the photoinduced demagnetization of FeRh proceeds on a sub-picosecond time scale. We propose a demagnetization mechanism that follows the electronic temperature of the system developed after laser excitation.

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Identifying growth mechanisms for laser-induced magnetization in FeRh

Cited by 46 publications

References 13 publications

Ferromagnetism at the interfaces of antiferromagnetic FeRh epilayers

Ferromagnetism at the interfaces of antiferromagnetic FeRh epilayers

Stability of ferromagnetic state of epitaxially grown ordered FeRh thin films

Laser-induced generation and quenching of magnetization on FeRh studied with time-resolved x-ray magnetic circular dichroism

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