Ferromagnetic resonance and spin-wave resonances in GaMnAsP films

Liu, Xinyu; Li, Xiang; Bac, Seul Ki; Zhang, Xucheng; Dong, Sining; Lee, Sanghoon; Dobrowolska, M.; Furdyna, J. K.

doi:10.1063/1.5006090

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…Consequently, the films were in a homogeneous magnetic state, as confirmed by our macroscopic magnetization loop measurements, magnetoresistance, and anomalous Hall data, which yielded a single Curie temperature, T c = 52K, and no heterogeneous features. [13,14] and promotes the out-of-plane easy axis at x > 0.07 for Mn concentrations ~4-6% [15,16]. However, in our multilayered films, where the P-concentration increases in small steps, the average stresses are reduced and the magnetization remains in the film plane, while retaining the ubiquitous [110] uniaxial inplane anisotropy.…”

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confidence: 76%

Extreme asymmetry of Néel domain walls in multilayered films of the dilute magnetic semiconductor (Ga,Mn)(As,P)

et al. 2018

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We report on unconventional perfectly shaped, fully asymmetric ~ 90 0 Neel domain walls in multilayered films of the diluted ferromagnetic semiconductor (Ga,Mn)(As,P) with stepwise variation of P-doping. Our results contradict micromagnetic calculations, which favor symmetric domain walls due to crystallographic anisotropy and stray field energy. We demonstrate that both the puzzling uniaxial in-plane anisotropy in the tetragonal multilayered film and the asymmetry of the domain walls could result from Dzyaloshinskii-Moriya interactions that are enhanced by the multiple sharp interfaces between the layers and from anisotropic nonrelativistic exchange coupling. Our finding shows that digital variations of composition during the molecular beam epitaxy can be used to tune the anisotropy and chirality of magnetic multilayers. Diluted magnetic semiconductors (DMSs) [1-5] are remarkable quantum materials that offer unique spintronics applications [6] and are full of surprises. In these materials, randomly distributed magnetic ions separated by tens of interatomic distances, interact

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confidence: 76%

Extreme asymmetry of Néel domain walls in multilayered films of the dilute magnetic semiconductor (Ga,Mn)(As,P)

et al. 2018

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“…Spin waves are normally investigated through four experimental methods: spin wave resonance (ferromagnetic resonance) [30][31][32][33][34], inelastic electron scattering (spin-resolved electron energy loss spectroscopy) [35][36][37][38][39], inelastic neutron scattering [40][41][42][43][44][45][46], and inelastic light scattering (Brillouin scattering and Raman scattering) [47][48][49][50][51][52][53][54][55][56][57][58][59][60]. Among these methods, inelastic light scattering would be the most convenient approach for studying spin waves, especially Raman scattering spectroscopy.…”

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confidence: 99%

Anomalous Behaviors of Spin Waves Studied by Inelastic Light Scattering

et al. 2019

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Magnonics, an emerging research field, aims to control and manipulate spin waves in magnetic materials and structures. However, the current understanding of spin waves remains quite limited. This review attempts to provide an overview of the anomalous behaviors of spin waves in various types of magnetic materials observed thus far by inelastic light scattering experiments. The anomalously large asymmetry of anti-Stokes to Stokes intensity ratio, broad linewidth, strong resonance effect, unique polarization selection, and abnormal impurity dependence of spin waves are discussed. In addition, the mechanisms of these anomalous behaviors of spin waves are proposed. spectroscopy is applied for studying vibrational properties of materials. However, due to the anomalous behaviors of spin wave scattering comparing with vibrational scattering, Raman spectroscopy study of spin wave is difficult and limited. In this paper, we present a review of anomalous behaviors of spin waves observed by inelastic light scattering experiments, especially by Raman spectroscopy. The large asymmetry of anti-Stokes to Stokes intensity ratio, broad linewidth, strong resonance effect, unique polarization selection, and abnormal impurity dependence of spin waves are discussed, and a proposed model for the mechanisms of spin flip, spin relaxing, and spin wave scattering is presented for understanding these anomalous behaviors of spin waves. In addition, two magnonic crystal structures are proposed for manipulating spin waves through analyses of the abnormal impurity dependence of spin waves. The review of the anomalous behaviors of spin waves and the proposed models provide the directions for easier experimental study of spin waves by inelastic light scattering, which will be useful for raising the research efforts for investigating spin waves. This is important for the emerging research of magnonics, which has received extensive interests in the modern magnetism research community.

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