Giant Vertical Magnetization Shift Caused by Field-Induced Ferromagnetic Spin Reconfiguration in Ni50Mn36Ga14 Alloy

Tian, Fanghua; Zhang, Yin; Zhou, Chao; Zhao, Quanbin; Yu, Zhonghai; Murtaza, Adil; Zuo, Wenlong; Yang, Sen; Song, Xiaoping

doi:10.3390/ma13214701

Cited by 4 publications

(2 citation statements)

References 44 publications

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“…Surprisingly at 5 and 50 K, hysteresis loops shift up in the magnetization (y) axis. Such kind of shifting is known as VMS which has the potential to revolutionize the future of ultrahigh-density magnetic recording technology [53]. It is defined as the shift of gravity centre of the hysteresis loop along the magnetization axis.…”

Section: Exchange Bias and Training Effectmentioning

confidence: 99%

Coexistence of tetragonal and cubic phase induced complex magnetic behaviour in CoMn₂O₄ nanoparticles

et al. 2023

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CoMn2O4 nanoparticles synthesized through facile co-precipitation technique, exhibit a mixed phase of tetragonal and cubic at room temperature. Rietveld fitting of the XRD pattern specifies 91.84% of the tetragonal phase and 8.16% of the cubic phase. Raman spectra and selected area electron diffraction pattern further confirm the structure. Transmission electron micrograph confirms the semi-spherical shape of the particles with average diameter 95 nm, are polycrystalline in nature. While 97% of Mn3+ and 3% of Co3+ occupy the octahedral site in the tetragonal phase, 52% of Mn3+ and 48% of Co2+ occupy the octahedral site in the cubic phase. XPS analysis further confirms the presence of both +2 and +3 oxidation states of Co and Mn. Magnetic measurement shows two magnetic transitions, Tc1 at 165 K and Tc2 at 93 K corresponding to paramagnetic to a lower magnetically ordered ferrimagnetic state followed by a higher magnetically ordered ferrimagnetic state, respectively. While Tc1 could be due to the cubic phase having inverse spinel structure, Tc2 is attributed to the tetragonal phase with normal spinel. The non-collinear triangular spin canting configuration of Mn3+ cations in octahedral sites while results in large magnetization near Tc2, the decrement in magnetization at the vicinity of Tc1 indicates the decrement in Mn3+ in octahedral site, well corroborated with XRD. In contrast to general temperature dependent HC observed in ferrimagnetic material, an unusual temperature dependent HC with high spontaneous exchange bias of 2.971 kOe and conventional exchange bias of 3.316 kOe at 50 K are observed. Interestingly, a high vertical magnetization shift (VMS) of 2.5 emu/g is observed at 5 K, attributed to the Yafet-Kittel spin structure of Mn3+ in the octahedral site. Such VMS has the potential to revolutionize the future of ultrahigh density magnetic recording technology. 

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Section: Exchange Bias and Training Effectmentioning

confidence: 99%

Coexistence of tetragonal and cubic phase induced complex magnetic behaviour in CoMn₂O₄ nanoparticles

et al. 2023

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“…VB can potentially give additional functionality in future advanced spintronic devices, e.g., multi-state magnetic recording technology, advanced sensor technologies, and perhaps greater robustness. [5][6][7] The vertical shift behavior has been observed in systems including polycrystalline ceramics, [8] core-shell magnetic nanoparticles, [9] single-phase thin films, [5,10] bilayer heterostructures [11,12] manganite-based superlattices, [13] etc. These vertical shifts are reported to originate due to the frozen spins in FM-spin glass interfaces, [8,9] uncompensated spins in doped AFM films, [10] defects and local disorder in epitaxial FM films, [5] exchange coupled FM-AFM bilayer systems, [11,12] canted AFM states in AFM-AFM superlattices, [13] etc.…”

Section: Introductionmentioning

confidence: 99%

Tuneable Vertical Hysteresis Loop Shift in Exchange Coupled La_0.67Sr_0.33MnO₃‐SrRuO₃ Bilayer

Bansal,

Anna de h‐Óra,

Akram

et al. 2024

Advanced Physics Research

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Harnessing extra degrees of freedom at the heterostructure interface is of crucial importance to bring additional functionalities in modern spintronic devices. Here, a vertical hysteresis loop shift (vertical bias) is demonstrated in an exchange biased system of ferromagnetic thin film heterostructure of La0.67Sr0.33MnO3 (10 nm)‐SrRuO3 (SRO) (20 nm), after field cooling with ±1 T below 100 K close to the Curie temperature (TC) ≈125 K of SRO and loop sweeping under ±1 T field. Besides, a positive exchange bias (HEB) is also observed below TC ≈125 K showing a maximum ≈11 mT at 2 K. The vertical shift is modeled closely using micromagnetic simulations and the layers’ thickness dependency is demonstrated. The reason for the shift is attributed to the simultaneous role of the interfacial antiferromagnetic interaction and the hard anisotropy of SRO against the Zeeman energy. Finally, from the experimental and simulation results, a generalized model of controllable and tunable vertical shift is proposed applicable for other material systems possessing glassy phases, uncompensated/canted spins, absent interfacial exchange coupling, etc., and hence can be informative for the use of vertical shift in future spintronic devices.

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Competition between Cubic and Tetragonal Phase Induced Unusual Vertical Magnetization Shift and Exchange Bias in Co_xMn_3−xO₄ (1 ≤ x ≤ 2) Spinel Nanoparticles

Rajput,

Rath

2024

Physica Status Solidi (b)

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CoxMn3−xO4 (1 ≤ x ≤ 2) spinel nanoparticles synthesized through conventional coprecipitation technique exhibit the coexistence of tetragonal and cubic phases in the range of 1 ≤ x ≤ 1.5, while a pure cubic phase is observed for 1.75 ≤ x ≤ 2 at room temperature. Reduction in tetragonal phase fraction from 92 % for x = 1 to 47% for x = 1.5 is attributed to diminution of Jahn–Teller (J–T) active Mn3+ ions occupying the octahedral site of spinel lattice. X‐ray photoelectron spectroscopy confirms both +2 and +3 oxidation states for Co and Mn. Surprisingly, cubic and tetragonal phases exhibit magnetic transition, Tc1 and Tc2, corresponding to a paramagnetic to a high and low temperature ferrimagnetic state, respectively. Tetragonal phase induces high spontaneous (HSEB) and conventional (HCEB) exchange bias with unusually high vertical magnetization shift (VMS) than that of the pure cubic phase, shows maximum HCEB of 4.062 kOe for x = 1.5 and a VMS of 2.5 emu g−1 for x = 1. Such dependence of VMS and exchange bias on tetragonal to cubic phase ratio in CoxMn3−xO4 is demonstrated for the first time and interpreted based on the interaction between different arrangement of spins in tetrahedral and octahedral sublattice.

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Giant Vertical Magnetization Shift Caused by Field-Induced Ferromagnetic Spin Reconfiguration in Ni50Mn36Ga14 Alloy

Cited by 4 publications

References 44 publications

Coexistence of tetragonal and cubic phase induced complex magnetic behaviour in CoMn₂O₄ nanoparticles

Coexistence of tetragonal and cubic phase induced complex magnetic behaviour in CoMn₂O₄ nanoparticles

Tuneable Vertical Hysteresis Loop Shift in Exchange Coupled La_0.67Sr_0.33MnO₃‐SrRuO₃ Bilayer

Competition between Cubic and Tetragonal Phase Induced Unusual Vertical Magnetization Shift and Exchange Bias in Co_xMn_3−xO₄ (1 ≤ x ≤ 2) Spinel Nanoparticles

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Giant Vertical Magnetization Shift Caused by Field-Induced Ferromagnetic Spin Reconfiguration in Ni50Mn36Ga14 Alloy

Cited by 4 publications

References 44 publications

Coexistence of tetragonal and cubic phase induced complex magnetic behaviour in CoMn2O4 nanoparticles

Coexistence of tetragonal and cubic phase induced complex magnetic behaviour in CoMn2O4 nanoparticles

Tuneable Vertical Hysteresis Loop Shift in Exchange Coupled La0.67Sr0.33MnO3‐SrRuO3 Bilayer

Competition between Cubic and Tetragonal Phase Induced Unusual Vertical Magnetization Shift and Exchange Bias in CoxMn3−xO4 (1 ≤ x ≤ 2) Spinel Nanoparticles

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Resources

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Coexistence of tetragonal and cubic phase induced complex magnetic behaviour in CoMn₂O₄ nanoparticles

Coexistence of tetragonal and cubic phase induced complex magnetic behaviour in CoMn₂O₄ nanoparticles

Tuneable Vertical Hysteresis Loop Shift in Exchange Coupled La_0.67Sr_0.33MnO₃‐SrRuO₃ Bilayer

Competition between Cubic and Tetragonal Phase Induced Unusual Vertical Magnetization Shift and Exchange Bias in Co_xMn_3−xO₄ (1 ≤ x ≤ 2) Spinel Nanoparticles