Irreversible magnetization in nickel nanoparticles

Zhang, P; Zuo, F.; Urban, Frank K.; Khabari, A.; Griffiths, P.; Hosseini-Tehrani, A.

doi:10.1016/s0304-8853(00)01379-2

Cited by 76 publications

(39 citation statements)

References 20 publications

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“…The fact that the temperature at which the irreversibility takes place decreases with increasing magnetic field [35] can be explained if the effects of the anisotropy field and the dipole-dipole interaction are overcome by the applied magnetic field. [36] Indeed, one of the most challenging questions in nanoparticulate systems concerns the collective dynamics at low temperatures. In a dilute system, the magnetic dipole-dipole interaction between the particles is negligible compared to the anisotropy energy of an individual nanoparticle.…”

Section: Resultsmentioning

confidence: 99%

Magnetic Properties of Ni/NiO Nanowires Deposited onto CNT/Pt Nanocomposites

Salgueiriño

Correa‐Duarte

Bañobre‐López

et al. 2008

Adv Funct Materials

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Several nanometer‐scale technological applications rely on the promising scenario of highly anisotropic magnetic materials. Bearing this in mind, we have studied the structure, magnetic properties, and interfacial exchange anisotropy effects of unique wires of Ni/NiO synthesized using carbon nanotubes as substrates. Structural analyses of these nanocomposites in correlation with magnetic measurements show that the crystalline NiO outer shells cause an enhanced exchange bias, providing an extra source of anisotropy that leads to their magnetization stability. These Ni/NiO nanowires, with a spin‐glass‐like behavior and with their magnetic moments in a blocked state over a wide temperature range that includes room temperature, should therefore inspire further study concerning the applicability of anisotropic structures.

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Section: Resultsmentioning

confidence: 99%

Magnetic Properties of Ni/NiO Nanowires Deposited onto CNT/Pt Nanocomposites

Salgueiriño

Correa‐Duarte

Bañobre‐López

et al. 2008

Adv Funct Materials

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“…Experimental measuring shows us, on the one side, that the relaxing time in such systems increases in the same time with the nanoparticle concentration decrease, which means it increases at the same time as the interaction strength's increases [12,[17][18][19], and on the other side, it shows a relaxing time decrease at the same time as the interaction strength increases [20].…”

Section: The Relaxation Times Distribution Considering the Superpositmentioning

confidence: 99%

“…Thus, due to the non-balance phenomena featured by irreversibility and hysteresis, in the nanoparticle systems appear magnetic memory effects, which are very important for applications in magnetic memory devices. In major speciality works [4][5][6][7], these effects are assigned to the appearance of the spine collective states featured by complex phenomena of spine-glass type. In this context the concept of blocking temperature T B [4][5][6][7], as a temperature when the system is passing to the spine-glass state, was introduced.…”

Section: Introductionmentioning

confidence: 99%

Relaxation Times in Magnetic Nanoparticles System and Memory Effects

2007

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Some memory effects in nanoparticle systems, similar to those seen in spin glass systems, may have important device applications, by tuning the interaction and the particle size. Recently, this subject provoked a special interest in nano-sciences. In this work we present a study, by simulation of the mode in which the behavior of a magnetic nanoparticle system is influenced by the superposition of the dimensions' distribution, the effective anisotropy constants and the disposal of nanoparticles in the sample, if we take into account the dipolar magnetic interaction.

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“…Приведенные выражения указывают на функциональную зави-симость J от аргумента MH/T, что, в свою очередь, позволяет оп-ределять на эксперименте по измерению начального наклона кри-вой ( ) J MH T , магнитный момент наночастиц, спонтанную намаг-ниченность, а также средний размер частицы (см., например, рабо-ты [34,35,62,120]). …”

Section: термоактивированная релаксация магнитных моментов ферромагниunclassified

Quantum and Structural-Dimensional Properties of Ferromagnetic Nanoparticles: Features of Nickel and Iron Cluster Systems

et al. 2010

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Построен формализм исследования магнитных свойств ферромагнитных наночастиц (кластеров). Установлено, что магнитные параметры наноча-стиц испытывают скачок при изменении их пространственной атомной структуры. Рассмотрены процессы термоактивированной и квантовой ре-лаксаций магнитных моментов кластеров. Показано, что, варьируя вели-чину внешнего магнитного поля, прикладываемого к наночастицам, мож-но менять в широком диапазоне физические характеристики магнитных квантовых флуктуаций (температуру кроссовера, скорость квантовых флуктуаций, время перемагничивания).Побудовано формалізм дослідження магнетних властивостей феромагнет-них наночастинок (кластерів). Встановлено, що магнетні параметри нано-частинок зазнають стрибок при зміні їх просторової атомарної структури. Розглянуто процеси термоактивованої та квантової релаксацій магнетних моментів кластерів. Показано, що варіюванням величини зовнішнього магнетного поля, що прикладене до наночастинок, можна змінювати в широкому діяпазоні фізичні характеристики магнетних квантових флюк-туацій (температуру кросоверу, швидкість квантових флюктуацій, час пе-ремагнетування).The investigation formalism for magnetic properties of ferromagnetic nanoparticles (clusters) is elaborated. As revealed, the magnetic parameters of nanoparticles discontinue due to variation of their spatial atomic structure. The processes of thermoactivated and quantum relaxations of clusters magnetic moments are considered. As shown, by the variation of a magnitude of external magnetic field applied to the nanoparticles, one can vary magnetic quantum-fluctuation physical characteristics (crossover temperature, quan- Fiz. Met. 2010, т. 11, сс. 139-173 Оттиски доступны непосредственно от издателя Фотокопирование разрешено только в соответствии с лицензией © 2010 ИМФ (Институт металлофизики им. Г. В. Курдюмова НАН Украины) Напечатано в Украине.

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Irreversible magnetization in nickel nanoparticles

Cited by 76 publications

References 20 publications

Magnetic Properties of Ni/NiO Nanowires Deposited onto CNT/Pt Nanocomposites

Magnetic Properties of Ni/NiO Nanowires Deposited onto CNT/Pt Nanocomposites

Relaxation Times in Magnetic Nanoparticles System and Memory Effects

Quantum and Structural-Dimensional Properties of Ferromagnetic Nanoparticles: Features of Nickel and Iron Cluster Systems

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