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

Heidarian, Alireza; Stienen, Sven; Семисалова, А.С.; Yuan, Ye; Josten, Elisabeth; Hübner, René; Salamon, Soma; Wende, Heiko; Gallardo, R. A.; Grenzer, J.; Potzger, К.; Bali, Rantej; Facsko, Stefan; Lindner, J.

doi:10.1002/pssb.201700145

Cited by 11 publications

(12 citation statements)

References 41 publications

(42 reference statements)

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“…14 The magnetic splitting of this third magnetic state also decreases upon heating. By using a Brillouin-function to describe the temperature dependence of the average B hf , one can determine an extrapolated Néel temperature T N = 615 ± 17 K for the first phase and a Curie temperature T C = 662 ± 13 K for the third phase, the latter being in reasonable agreement with the Curie temperature obtained by magnetometry on thin films (T C = 670 K)48 and bulk materials (T C = 675 K) 49. In the chemically disordered system after irradiation with 25 keV Ne + with a small ion fluence (figure 2iii), changes in the magnetically ordered state are observed.…”

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confidence: 69%

Magnetic response of FeRh to static and dynamic disorder

et al. 2020

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Changes of the magnetic and crystal structure on the microscopic scale in 40 nm FeRh thin films have been applied to investigate the phenomena of a disorder induced ferromagnetism at room temperature initiated through light ion-irradiation with fluences 1 arXiv:1911.11256v1 [cond-mat.mtrl-sci] 25 Nov 2019 up to 0.125 Ne + /nm −2 . Magnetometry shows an increase of magnetic ordering at low temperatures and a decrease of the transition temperature combined with a broadening of the hysteresis with rising ion fluence. 57 Fe Mössbauer spectroscopy reveals the occurrence of an additional magnetic contributions with an hyperfine splitting of 27.2 T -identical to that of ferromagnetic B2-FeRh. The appearance of an anti-site Fe-contribution can be assumed to be lower than 0.6 Fe-at%, indicating that no change of the chemical composition is evident. The investigation of the local structure shows an increase of the static mean square relative displacement determined by X-ray absorption fine structure spectroscopy, while an increase of the defect-concentration has been determined by positron annihilation spectroscopy. From the changes of the microscopic magnetic structure a similarity between the temperature induced and the structural disorder induced ferromagnetic phase can be observed. These findings emphasize the relationship between magnetic ordering and the microscopic defect structure in FeRh.

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confidence: 69%

Magnetic response of FeRh to static and dynamic disorder

et al. 2020

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“…Fundamentally, a closer insight into spin-dependent transport in its AFM state and the related spin dynamics during the phase transition are crucial issues. Although X-ray magnetic circular dichroism (XMCD) 13,[16][17][18] , ferromagnetic resonance (FMR) [19][20][21] , and time-resolved methods 13,14 have been adopted to study magnetization dynamics, direct experimental observation of spin generation and detection in FeRh is highly desired.…”

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confidence: 99%

Spin pumping during the antiferromagnetic–ferromagnetic phase transition of iron–rhodium

et al. 2020

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FeRh attracts intensive interest in antiferromagnetic (AFM) spintronics due to its first-order phase transition between the AFM and ferromagnetic (FM) phase, which is unique for exploring spin dynamics in coexisting phases. Here, we report lateral spin pumping by which angular momentum is transferred from FM domains into the AFM matrix during the phase transition of ultrathin FeRh films. In addition, FeRh is verified to be both an efficient spin generator and an efficient spin sink, by electrically probing vertical spin pumping from FM-FeRh into Pt and from Py into FeRh, respectively. A dramatic enhancement of damping related to AFM-FeRh is observed during the phase transition, which we prove to be dominated by lateral spin pumping across the FM/AFM interface. The discovery of lateral spin pumping provides insight into the spin dynamics of magnetic thin films with mixed-phases, and the significantly modulated damping advances its potential applications, such as ultrafast spintronics.

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“…Instead, work has been focused on understanding size effects, 10,11 annealing treatments, [12][13][14][15] and transition mechanics. [16][17][18][19][20] The few compositional studies on Fe 1Àx Rh x films omit transport properties entirely, emphasizing magnetic attributes, 21 or are based on inhomogeneous polycrystalline layers containing secondary phases. 22 Here, we systematically examine the structural, morphological, magnetic, and transport properties as a function of rhodium fraction x of phase-pure epitaxial Fe 1Àx Rh x films with the CsCl structure deposited on (001)-oriented MgO substrates.…”

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Structural, magnetic, and transport properties of Fe1−xRhx/MgO(001) films grown by molecular-beam epitaxy

Mei

Tang

Grab

et al. 2018

Applied Physics Letters

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Fe 1Àx Rh x layers are grown with varying rhodium fraction x on (001)-oriented MgO substrates by molecular-beam epitaxy. Film structural, morphological, magnetic, and transport properties are investigated. At room temperature, layers are ferromagnetic (FM) for x < 0.48 and antiferromagnetic (AF) for x > 0.48. Separating the two magnetically ordered phases at x ¼ 0.48 is an abrupt change in the Fe 1Àx Rh x lattice parameter of Da ¼ 0.0028 nm (Da/a ¼ À0.9%). For AF layers, the FM state is recovered by heating across a first-order phase transition. The transition leads to a large resistivity modulation, Dq/q ¼ 80%, over a narrow temperature range, DT ¼ 3 K, in stoichiometric Fe 0.50 Rh 0.50 /MgO(001). For samples with compositions deviating from x ¼ 0.50, fluctuations broaden DT and defect scattering reduces Dq/q.

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

Cited by 11 publications

References 41 publications

Magnetic response of FeRh to static and dynamic disorder

Magnetic response of FeRh to static and dynamic disorder

Spin pumping during the antiferromagnetic–ferromagnetic phase transition of iron–rhodium

Structural, magnetic, and transport properties of Fe1−xRhx/MgO(001) films grown by molecular-beam epitaxy

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