Tuning the antiferromagnetic to ferromagnetic phase transition in FeRh thin films by means of low-energy/low fluence ion irradiation

Heidarian, Alireza; Bali, Rantej; Grenzer, J.; Wilhelm, R.; Heller, R.; Yıldırım, O.; Lindner, J.; Potzger, К.

doi:10.1016/j.nimb.2015.06.027

Cited by 22 publications

(22 citation statements)

References 22 publications

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“…Hence, anti-site Fe (Fe on an initial Rh site with B hf (F e II = 38 T) is not created, as one can observe for a Fe-rich B2-FeRh sample, or also the formation of the A2 phase 14 (B hf (A2) = 35 T) does not occur. As discussed for the MÃűssbauer results, one can see that the samples have different amounts of A1-FeRh (blue central singlet), showing an inhomogeneous distribution of this impurity phase,47 while for the present low irradiation fluences a formation of additional A1-FeRh does not occur [22][23][24].…”

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confidence: 50%

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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Magnetic response of FeRh to static and dynamic disorder

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“…A similar persistence of FM below the transition temperature for undosed films has been recently interpreted as interfacial magnetization at the bottom and top of the film, attributed to epitaxial and surface strain [7,8,19]. However, in He-implanted samples, the apparent controllability of this FM ordering lends to question the nature of this phenomenon in irradiated samples [15,16,20]. Traditional magnetometry can only measure the total magnetization of the specimen, providing no insight into the spatial, interfacial, or strain-driven origins of these thermomagnetic effects.…”

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confidence: 65%

“…From thermomagnetic M vs. T measurements this is evident as an increase in the magnitude of the magnetization below the transition temperature and nominally in the AF phase (see black arrow in Figure 1(b)). Previous measurements of irradiated FeRh films with traditional magnetometer techniques have witnessed a similar FM background ordering [15][16][17][18].…”

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confidence: 75%

“…For this study, a series of epitaxial c-axis-oriented FeRh films ( ∼ 40 nm) were grown with a Ag ( ∼ 15 nm) cap as an ion stopping layer on MgO 001 crystal substrates and the films implanted ex situ with He ions, as illustrated in Figure 1(a). Recent studies using neon (20.18 u) ion implantation with an energy of 20 keV resulted in significant film damage and disorder-induced FM [15]. Here, low-energy (3.8 keV) and low-mass (4.00 u) He ions are chosen to reduce disorder and surface sputtering as well as yield a gradient vacancy profile along the film depth.…”

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confidence: 99%

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Magnetic order multilayering in FeRh thin films by He-Ion irradiation

Bennett

Herklotz

Cress

et al. 2017

Materials Research Letters

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The heterointerfacing of different materials with competing magnetic orders forms the basis for today's spintronic devices, however materials compatibility has remained a major limitation to the conception of new multilayered systems. Here, we uncover a multilayer of competing magnetic orders within a single layer of FeRh after low-energy He-ion irradiation: metamagnetic, ferromagnetic, and spin glass. Polarized neutron reflectometry, irradiation modeling, and density functional theory calculations reveal a direct correlation between the disorder concentration, the depth-dependent magnetic ordering, and the onset of the metamagnetic transition. Such a heterostructure opens the door to new paradigms in antiferromagnetic electronics and ultra-low-power magnetization controllability. IMPACT STATEMENT This unlocks the possible use of intrinsic magnetism as a state-variable for logical computation via a top-down approach to the multilayering/control of magnetic order in a single metamagnetic thin film.

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“…On the other hand, in Ref. , ion beam induced chemical disorder in FeRh was found to be connected with (i) broadening of the temperature range of the phase transition; (ii) shift of the phase transition temperature towards smaller values; (iii) a ferromagnetic background at low temperatures depending on the ion fluence. A canted phase transition can be assigned to structural inhomogeneity, for example chemical disorder, directly determining the canting angle .…”

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confidence: 96%

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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Tuning the antiferromagnetic to ferromagnetic phase transition in FeRh thin films by means of low-energy/low fluence ion irradiation

Cited by 22 publications

References 22 publications

Magnetic response of FeRh to static and dynamic disorder

Magnetic response of FeRh to static and dynamic disorder

Magnetic order multilayering in FeRh thin films by He-Ion irradiation

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

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