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Skyrmion-(non)crystal structure stabilized by dipolar interaction

Rare Metals 2022年第9期41卷 3160-3169页

作者： Ming-Xiu Sui Yong Hu Department of Physics College of SciencesNortheastern UniversityShenyang110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819China

We report a numerical study on the role of longrange dipolar interaction played on the creation and stabilization of skyrmion-(non)crystal structure in chiral ferromagnetic thin films without any anisotropies,based on a Monte-Carlo simulation method.With the increase of external magnetic field,the microscopic spin configuration is transformed from a spin-spiral stripe or labyrinth structure,depending on the strength of dipolar interaction,into a skyrmion-(non)crystal structure,and then into a skyrmiongas structure,and finally into a ferromagnetic state.Interestingly,with the increase of dipolar interaction,the skyrmion-crystal structure evolves from a triangular arrangement into a square arrangement with the change of skyrmion shape from circle to square.For larger dipolar interactions,the skyrmion-crystal structure loses the regular arrangements and the skyrmions,remaining topological,exhibit different shapes and sizes and squeeze with each other,whose distributions are analogous to a non-crystal structure.Therefore,different skyrmion-(non)crystal structures are stabilized in different ranges of dipolar interactions,which further promotes the applications of skyrmions as non-volatile information carriers.

关键词： Chiral ferromagnetic thin film Skyrmion(non)crystal structure Interfacial Dzyaloshinskii-Moriya interaction dipolar interaction Monte-Carlo simulation

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Large-scale area of magnetically anisotropic nanoparticle monolayer films deposited by MAPLE

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Journal of Materials Science & Technology 2022年第11期106卷 28-32页

作者： Lei Zhang Feng Xu Jian Zhang Baoru Bian Yong Hu Fei Xue Juan Du Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Material Technology&EngineeringChinese Academy of SciencesNingbo 315201China Institute of Materials School of Materials Science and EngineeringShanghai UniversityShanghai 200444China University of Chinese Academy of Sciences Beijing 100049China College of Sciences Northeastern UniversityShenyang 110819China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryChinese Academy of SciencesHefei 230031China

Magnetically anisotropic nanoparticle monolayer films are of great interest for the development of ap-plications such as high-density data storage,sensors.However,the formation of large-scale magnetically anisotropic monolayer film is a challenging task.Here,we provide a new way to fabricate large-scale area of Fe_(3)O_(4) nanoparticle monolayer films by vacuum deposition technique(matrix-assisted pulsed laser evaporation,MAPLE).During the deposition process,only interactions between nanoparticles influence nanoparticle self-assembly behaviors.A strong magnetic anisotropy,characterized by in-plane and out-of-plane coercivity and saturation field obtained by DCM(dynamic cantilever magnetometry),was obtained both in cubic and spherical Fe_(3)O_(4) nanoparticle monolayer films.The inter-particle dipolar interaction but not crystal anisotropy is responsible for this effective magnetic anisotropy,which has been proved by Monte-Carlo simulations.

关键词： Nanoparticle monolayer film Magnetic anisotropy MAPLE Dynamic cantilever magnetometry Monte-Carlo simulation dipolar interaction

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Effects of dipolar interactions on the magnetic hyperthermia of Zn_(0.3)Fe_(2.7)O_(4) nanoparticles with different sizes

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Chinese Physics B 2021年第1期30卷 497-501页

作者：俞翔米岩王利晨李峥睿吴迪安刘若水贺淑莉 Department of Physics Capital Normal UniversityBeijing 100048China

Tumor-targeted magnetic hyperthermia has recently attracted much attention.Magnetic nanoparticles(NPs) are heat mediator nanoprobes in magnetic hyperthermia for cancer treatment.In this paper,single cubic spinel structural Zn_(0.3)Fe_(2.7)O_(4) magnetic NPs with sizes of 14 nm-20 nm were synthesized,followed by coating with SiO_(2) shell.The SLP value of Zn_(0.3)Fe_(2.7)O_(4)/SiO_(2) NPs below 20 nm changes non-monotonically with the concentration of solution under the alternating current(AC) magnetic field of 430 kHz and 27 kA/m.SLP values of all Zn_(0.3)Fe_(2.7)O_(4)/SiO_(2) NPs appear a peak value with change of solution concentration.The solution concentrations with optimal SLP value decrease with increasing magnetic core size.This work can give guidance to the better prediction and control of the magnetic hyperthermia performance of materials in clinical applications.

关键词： magnetic nanoparticles dipolar interaction magnetic hyperthermia

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Effect of Thickness on Magnetic dipolar and Exchange interactions in SmCo/FeCo/SmCo Thin Films

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Advances in Materials Physics and Chemistry 2015年第9期5卷 368-373页

作者： Carlos Ivan Rodriguez Rodriguez Jose Rurik Farias Mancilla Karla Edith Vega Chavez Francisco Espinosa Magana Sion Federico Olive Mendez Jose Trinidad Elizalde Galindo Instituto de Ingenieria y Tecnologia Universidad Autonoma de Ciudad JuarezCiudad JuarezMexico Universidad Tecnologica de Ciudad Juarez Ciudad JuarezMexico Centro de Investigacion de Materiales Avanzados(CIMAV) ChihuahuaMexico

SmCo/FeCo/SmCo trilayer was deposited with two different thickness configurations for soft phase (FeCo);50 nm/10 nm/50 nm and 50 nm/25 nm/50 nm were deposited on Si (111) substrate and Ta (50 nm) seed layer by RF magnetron sputtering in a pressure, p, of 30 - 35 m Torr. After deposition the films were annealed under Ar atmosphere at temperature T equal to 923 and 973 for different times followed by quenching in water. X-ray diffraction patterns were obtained to identified phase presents and calculate average crystallite size. To study the effect of configuration thickness in soft phases, DC magnetic measurements were carried out;the measurements were done in the temperature interval of 300 - 50 K. Hysteresis loops collected at low temperatures exposed an increment in coercivity with the decrease of T and at same time, presented a “knee” in the second quadrant of the demagnetization curve, which suggests that the inter-layer exchange coupling becomes less effective, being more evident for sample with 50 nm/25 nm/50 nm thickness. Moreover, δM (H) plots were calculated from magnetic measurements at three different temperatures, T, equal to 300, 150 and 50 K, which corroborates that the dipolar interactions became stronger when thickness of soft phases increases. Finally, the thickness effect is attributed to the SmCo5 phase magnetocrystalline anisotropy constant, which is responsible for the exchange coupling length.

关键词： Exchange interactions dipolar interaction Anisotropy

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