Spin-reorientation phase transitions in thin films of RETM amorphous alloys

Sayko, G.V.; Utochkin, S. N.; Zvezdin, A. K.

doi:10.1016/0304-8853(92)91267-w

Cited by 9 publications

(10 citation statements)

References 13 publications

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“…In the sperimagnetic phase there exists a distribution of magnetic moments within a cone directed along the easy axis, which broadens the phase transitions, and, thus, might be the reason behind an increased temperature range of this firstorder phase transition up to 10 K in the experiment. The sperimagnetism of rare-earth -transition metal compounds has been studied earlier [28][29][30][31][32][33] . To explain qualitatively the observed magnetic behavior, let us consider the following simple model.…”

Section: Discussionmentioning

confidence: 99%

Unusual Field Dependence of the Anomalous Hall Effect in Ta/Tb−Fe−Co

et al. 2020

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Experimental studies of anomalous Hall effect are performed for thin filmed Ta/TbFeCo in a wide range of temperatures and magnetic fields up to 3 T. While far from the compensation temperature (T M =277 K) the field dependence has a conventional shape of a single hysteresis loop, just below the compensation point the dependence is anomalous having the shape of a triple hysteresis. To understand this behavior, we experimentally reveal the magnetic phase diagram and theoretically analyze it in terms of spinreorientation phase transitions. We show that one should expect anomalous hysteresis loops below the compensation point if in the vicinity of it the magnetic anisotropy is dominated by FeCo sublattice due to interaction with Ta. 19 , here the situation is inverted that the triple hysteresis is observed below T M . More particularly, using Hall bar structures of MgO/Ta/TbFeCo we measured field dependencies

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Section: Discussionmentioning

confidence: 99%

Unusual Field Dependence of the Anomalous Hall Effect in Ta/Tb−Fe−Co

et al. 2020

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“…The thickness and finite size of a ferrimagnetic film can also significantly affect the spin-reorientation transitions and change the phase diagram. Theoretical [20,21] and experimental [22] * zvezdin.ka@phystech.edu studies on the effect of the surface on the spin dynamics were carried out for example for nanowires [23] and for various ferrimagnetic materials [24,25]. However, given the new experimental and theoretical results, this area requires further study, and the influence of the surface effects on the FiM phase diagram deserves particular attention.…”

Section: Introductionmentioning

confidence: 99%

Phase transitions in rare-earth ferrimagnets with surface anisotropy near the magnetization compensation point

Yurlov¹,

Zvezdin

Zvezdin³

2021

Preprint

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We report of a theoretical model for calculating the H-T phase diagrams of a rare-earth ferrimagnet, taking into account anisotropies originated by both magnetization sublattices' and by the surface. The possibility of an exchange spring formation due to surface anisotropy is considered. This situation is realized in heterostructures containing a ferrimagnet and a heavy metal. We derive the stability lose lines of the collinear phase from the free energy of the two sublattice ferrimagnet. We numerical calculate the magnetic phase diagrams for the cases when the magnetic field applied along and perpendecular to the easy axis. We demonstrate that tricritical point down at the low field range due to surface anisotropy effect. Moreover, the line of the first order phase transition between angular and collinear phases reduces due to surface anisotropy. In the case when magnetic field is applied perpendicular to the easy axis we show the possibility of the first order phase transition between two collinear phases in contrast to the phase diagram without surface anisotropy.

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“…Many of the transition-metal-metalloid (TM 83 met 17 type) glasses are non-collinear ferromagnets [1] and the introduction of rare-earth (RE) ions to these has the potential to change their magnetic structures significantly. The magnetic structures in binary, amorphous rare-earth-transition-metal (RE-TM) alloys are usually described in terms of a non-collinear RE sublattice immersed in a ferromagnetic matrix [2,3]. These non-collinear structures arise because the large spin-orbit coupling at the RE sites leads to large local anisotropies which compete with the exchange interactions.…”

Section: Introductionmentioning

confidence: 99%

“…The magnetic structures in binary, amorphous rare earth -transition metal (RE-TM) alloys are usually described in terms of a non-collinear RE sublattice immersed in a ferromagnetic matrix [2,3]. These non-collinear structures arise because the large spin-orbit coupling at the RE sites leads to large local anisotropies which compete with the exchange interactions.…”

Section: 0) Introductionmentioning

confidence: 99%

Sperimagnetism in Fe₇₈Er₅B₁₇and Fe₆₄Er₁₉B₁₇metallic glasses: I. Moment values and non-collinear components

Wildes

Cowlam

2011

J. Phys.: Condens. Matter

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Magnetization measurements have been made on a Fe64Er19B17 glass, which exhibits ferrimagnetic compensation at Tcomp = 112 K, and polarized beam neutron scattering measurements have been made on Fe78Er5B17 and Fe64Er19B17 glasses to supplement the measurements made earlier on Fe64Er19B17. The magnetization data were analysed with a phenomenological model, to find the magnetic moments and their components needed to interpret the neutron data. Four spin-dependent scattering cross-sections were obtained in absolute units from each neutron experiment, to determine the atomic-scale magnetic structures of the two glasses. The finite spin-flip cross-sections confirmed that these (Fe,Er)83B17 glasses are non-collinear ferrimagnets. The cross-sections were calculated using a model based on random cone arrangements of the magnetic moments. The moment values and the random cone angles were refined in the calculations, which produced good agreement between the calculated curves and the experimental data. The forward limit of the spin-flip cross-sections |∂σ±∓/∂Ω|Q=0 of the Fe64Er19B17 glass which peaked at Tcomp and the temperature variation of the total scattering amplitudes (b∓p∥(Q)) suggested that the random cone angles open fully so that the collinear components p∥(Q) tend to zero at Tcomp. The ferrimagnetic compensation is therefore characterized by an equality of the magnetic sublattices; the reversal of the magnetic structure and a compensated sperimagnetic phase which appears at Tcomp.

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Spin-reorientation phase transitions in thin films of RETM amorphous alloys

Cited by 9 publications

References 13 publications

Unusual Field Dependence of the Anomalous Hall Effect in Ta/Tb−Fe−Co

Unusual Field Dependence of the Anomalous Hall Effect in Ta/Tb−Fe−Co

Phase transitions in rare-earth ferrimagnets with surface anisotropy near the magnetization compensation point

Sperimagnetism in Fe₇₈Er₅B₁₇and Fe₆₄Er₁₉B₁₇metallic glasses: I. Moment values and non-collinear components

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Spin-reorientation phase transitions in thin films of RETM amorphous alloys

Cited by 9 publications

References 13 publications

Unusual Field Dependence of the Anomalous Hall Effect in Ta/Tb−Fe−Co

Unusual Field Dependence of the Anomalous Hall Effect in Ta/Tb−Fe−Co

Phase transitions in rare-earth ferrimagnets with surface anisotropy near the magnetization compensation point

Sperimagnetism in Fe78Er5B17and Fe64Er19B17metallic glasses: I. Moment values and non-collinear components

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Sperimagnetism in Fe₇₈Er₅B₁₇and Fe₆₄Er₁₉B₁₇metallic glasses: I. Moment values and non-collinear components