Quenching of the Hopkinson maximum under contamination in the system Gd(0001)/W(110)

Salas, F.H.; Mirabal-Garca, Manuel

doi:10.1103/physrevb.41.10859

Cited by 22 publications

(6 citation statements)

References 16 publications

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“…Similar behaviour was already observed e.g. in RPdIn [14], some soft magnetic materials such as Fe-Cu-Nb-Si-B [15] and Gd thin films [16]. The temperature dependence of magnetization at 10 Oe has been measured at two different modes.…”

Section: Resultssupporting

confidence: 56%

Influence of Transition Metal Substitution on the Low-Field Magnetic Properties in the Gd(Ni_1-xT_x)₃ (T = Fe, Co) Intermetallic Compounds

Bajorek

Chełkowska

2018

Acta Phys. Pol. A

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The low-field magnetic properties of polycrystalline Gd(Ni1¡xTxq3 (T = Fe, Co) intermetallic compounds are presented. The whole system crystallizes in the rhombohedral PuNi3 type of crystal structure. The composition dependence of the Curie temperature TCpxq is associated with the change in the number of 3d electrons. Moreover, the field cooled and zero field cooled (FC-ZFC) curves at low applied magnetic field are related to the anisotropy of T element. The saturation magnetic moment MSpxq upon doping was estimated based on the hysteresis loops M pHq.

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Section: Resultssupporting

confidence: 56%

Influence of Transition Metal Substitution on the Low-Field Magnetic Properties in the Gd(Ni_1-xT_x)₃ (T = Fe, Co) Intermetallic Compounds

Bajorek

Chełkowska

2018

Acta Phys. Pol. A

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“…The emergence of a maximum in AC susceptibility below Curie temperature is called Hopkinson maximum (45). This effect is observed often in soft magnets such as ferrites and in materials that undergo a magnetization reversal (45,46). This feature is explained in the framework of the Stoner− Wohlfarth model, which is related to domain wall motion (47).…”

Section: Magnetic Characterizationmentioning

confidence: 98%

Atomic-scale determination of spontaneous magnetic reversal in oxide heterostructures

Saghayezhian

Kouser

Wang

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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Interfaces between transition metal oxides are known to exhibit emerging electronic and magnetic properties. Here we report intriguing magnetic phenomena for La 2/3 Sr 1/3 MnO 3 films on an SrTiO 3 (001) substrate (LSMO/STO), where the interface governs the macroscopic properties of the entire monolithic thin film. The interface is characterized on the atomic level utilizing scanning transmission electron microscopy and electron energy loss spectroscopy (STEM-EELS), and density functional theory (DFT) is employed to elucidate the physics. STEM-EELS reveals mixed interfacial stoichiometry, subtle lattice distortions, and oxidation-state changes. Magnetic measurements combined with DFT calculations demonstrate that a unique form of antiferromagnetic exchange coupling appears at the interface, generating a novel exchange spring-type interaction that results in a remarkable spontaneous magnetic reversal of the entire ferromagnetic film, and an inverted magnetic hysteresis, persisting above room temperature. Formal oxidation states derived from electron spectroscopy data expose the fact that interfacial oxidation states are not consistent with nominal charge counting. The present work demonstrates the necessity of atomically resolved electron microscopy and spectroscopy for interface studies. Theory demonstrates that interfacial nonstoichiometry is an essential ingredient, responsible for the observed physical properties. The DFT-calculated electrostatic potential is flat in both the LSMO and STO sides (no internal electric field) for both Sr-rich and stoichiometric interfaces, while the DFT-calculated charge density reveals no charge transfer/ accumulation at the interface, indicating that oxidation-state changes do not necessarily reflect charge transfer and that the concept of polar mismatch is not applicable in metal−insulator polar−nonpolar interfaces. magnetism | thin films | electron microscopy | oxide interfaces | density functional theory T ransition metal oxides (TMOs) exhibit a wide range of electrical, magnetic, and optical properties largely because they can be easily alloyed and the 10 slots in the transition metal atom d orbitals allow for very diverse spin arrangements. Adding strong electron−lattice coupling and easily formed oxygen vacancies to this mix, the result is a large number of coupled degrees of freedom. Therefore, it is not surprising that TMO heterostructures exhibit highly unusual behavior, induced by interfaces between different oxides where symmetry discontinuities occur, leading to properties that are absent in bulk (1-5). A wellknown example is the LaAlO 3 /SrTiO 3 (001) heterostructure, where a 2D electron gas with high mobility forms at the interface between two insulating oxides (6), including the appearance of superconductivity (7) and background ferromagnetic (FM) ordering (8). In many cases, the symmetry discontinuity at the interface strongly modifies the transition metal−oxygen octahedra network, inducing changes in local structure (bond geometry) and local stoichiometry. Thes...

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“…A thermal irreversibility clearly appears for fields below 2000 Oe, as evidenced by the nonzero difference between the FC and ZFC magnetizations. For each field, the presence of a Hopkinson maximum [23][24][25] is observed. The FC curves do not vary monotonously; they initially decrease with temperature and increase before reaching the maximum and finally decrease again once the maximum is passed, due to the transition to the paramagnetic phase.…”

Section: A Zero-field-and Field-cooled Magnetization Curvesmentioning

confidence: 99%

Interfacial spin-glass-like state inMn5Ge3single crystalline films grown on germanium substrates

et al. 2015

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Thermal irreversibility of the magnetization in Mn 5 Ge 3 epitaxial thin films on Ge(111) is reported. The frequency dependence of the ac susceptibility demonstrates a spin-glass-like behavior, despite the fact that the thin film is a single crystal. Such glassy behavior is attributed to the presence of a "ferromagnetically dead" layer with spin-glass-like properties at the Mn 5 Ge 3 /Ge interface, which results in frustrated interactions with the ferromagnetic Mn 5 Ge 3. Moreover, it is shown that the magnetic phase diagram in the H-T plane of the glassy state is very sensitive to the growth conditions. Variation in the growth temperature and film thickness changes the spin-glass-like properties and the Curie temperature. The sensitivity of the glassy state to the growth conditions is related to the variation in the properties of the interfacial layer.

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Quenching of the Hopkinson maximum under contamination in the system Gd(0001)/W(110)

Cited by 22 publications

References 16 publications

Influence of Transition Metal Substitution on the Low-Field Magnetic Properties in the Gd(Ni_1-xT_x)₃ (T = Fe, Co) Intermetallic Compounds

Influence of Transition Metal Substitution on the Low-Field Magnetic Properties in the Gd(Ni_1-xT_x)₃ (T = Fe, Co) Intermetallic Compounds

Atomic-scale determination of spontaneous magnetic reversal in oxide heterostructures

Interfacial spin-glass-like state inMn5Ge3single crystalline films grown on germanium substrates

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Quenching of the Hopkinson maximum under contamination in the system Gd(0001)/W(110)

Cited by 22 publications

References 16 publications

Influence of Transition Metal Substitution on the Low-Field Magnetic Properties in the Gd(Ni1-xTx)3 (T = Fe, Co) Intermetallic Compounds

Influence of Transition Metal Substitution on the Low-Field Magnetic Properties in the Gd(Ni1-xTx)3 (T = Fe, Co) Intermetallic Compounds

Atomic-scale determination of spontaneous magnetic reversal in oxide heterostructures

Interfacial spin-glass-like state inMn5Ge3single crystalline films grown on germanium substrates

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Product

Resources

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Influence of Transition Metal Substitution on the Low-Field Magnetic Properties in the Gd(Ni_1-xT_x)₃ (T = Fe, Co) Intermetallic Compounds

Influence of Transition Metal Substitution on the Low-Field Magnetic Properties in the Gd(Ni_1-xT_x)₃ (T = Fe, Co) Intermetallic Compounds