Influence of substrate and temperature on the shape of deposited Fe, Co, and FeCo nanoparticles

Rosellen, Wolfgang; Kleinhans, Christian; Hückelkamp, Volker; Bulut, Furkan; Kleibert, Armin; Bansmann, Joachim; Getzlaff, M.

doi:10.1002/pssb.200945569

Cited by 8 publications

(2 citation statements)

References 27 publications

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“…The low kinetic energy per atom (usually less than 0.1 eV per atom) of the nanoparticles allows soft-landing deposition experiments well below the fragmentation threshold [39]. Accordingly, recent STM studies revealed that the shape of larger particles ( D > 4 nm) is only weakly affected when being deposited onto single crystalline substrates, i.e., the height of supported particles as measured with STM corresponds well with the size being determined by TEM [28,40–41]. This is a particular strength of soft-landing techniques.…”

Section: Methodsmentioning

confidence: 94%

Structure, morphology, and magnetic properties of Fe nanoparticles deposited onto single-crystalline surfaces

Kleibert

Rosellen²,

Getzlaff

et al. 2011

Beilstein J. Nanotechnol.

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Summary Background: Magnetic nanostructures and nanoparticles often show novel magnetic phenomena not known from the respective bulk materials. In the past, several methods to prepare such structures have been developed – ranging from wet chemistry-based to physical-based methods such as self-organization or cluster growth. The preparation method has a significant influence on the resulting properties of the generated nanostructures. Taking chemical approaches, this influence may arise from the chemical environment, reaction kinetics and the preparation route. Taking physical approaches, the thermodynamics and the kinetics of the growth mode or – when depositing preformed clusters/nanoparticles on a surface – the landing kinetics and subsequent relaxation processes have a strong impact and thus need to be considered when attempting to control magnetic and structural properties of supported clusters or nanoparticles. Results: In this contribution we focus on mass-filtered Fe nanoparticles in a size range from 4 nm to 10 nm that are generated in a cluster source and subsequently deposited onto two single crystalline substrates: fcc Ni(111)/W(110) and bcc W(110). We use a combined approach of X-ray magnetic circular dichroism (XMCD), reflection high energy electron diffraction (RHEED) and scanning tunneling microscopy (STM) to shed light on the complex and size-dependent relation between magnetic properties, crystallographic structure, orientation and morphology. In particular XMCD reveals that Fe particles on Ni(111)/W(110) have a significantly lower (higher) magnetic spin (orbital) moment compared to bulk iron. The reduced spin moments are attributed to the random particle orientation being confirmed by RHEED together with a competition of magnetic exchange energy at the interface and magnetic anisotropy energy in the particles. The RHEED data also show that the Fe particles on W(110) – despite of the large lattice mismatch between iron and tungsten – are not strained. Thus, strain is most likely not the origin of the enhanced orbital moments as supposed before. Moreover, RHEED uncovers the existence of a spontaneous process for epitaxial alignment of particles below a critical size of about 4 nm. STM basically confirms the shape conservation of the larger particles but shows first indications for an unexpected reshaping occurring at the onset of self-alignment. Conclusion: The magnetic and structural properties of nanoparticles are strongly affected by the deposition kinetics even when soft landing conditions are provided. The orientation of the deposited particles and thus their interface with the substrate strongly depend on the particle size with consequences regarding particularly the magnetic behavior. Spontaneous and epitaxial self-alignment can occur below a certain critical size. This may enable the obtainment of samples with controlled, uniform interfaces and crystallographic orientations even in a random deposition process. However, such a reorientation process might be accompanied by a complex reshapin...

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Section: Methodsmentioning

confidence: 94%

Structure, morphology, and magnetic properties of Fe nanoparticles deposited onto single-crystalline surfaces

Kleibert

Rosellen²,

Getzlaff

et al. 2011

Beilstein J. Nanotechnol.

Self Cite

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show abstract

“…Na área de química, a deposição controlada de nanopartículas em superfícies pode ser feita para a construção de sítios orientados para atuarem como catalisadores em reações de interesse [135], bem como na fabricação de tintas magnéticas [16,17]. Em eletrônica, recentes estudos experimentais envolvendo nanopartículas de ferro e cobalto depositadas em superfícies relatam distorções estruturais que podem ser controladas através da direção cristalina do corte da superfície [136]. Mecanismos como este podem ser usados no futuro para a construção bottom-up de novos dispositivos magnéticos.…”

Section: O N S I D E R a ç õ E S F I N A I S E P E R S P E C T I Va Sunclassified

Estudo ab initio de propriedades estruturais e magnéticas de nanopartículas de metais de transição

Faccin¹,

Silva²

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In‐Flight and Postdeposition Manipulation of Mass‐Filtered Nanoparticles under Soft‐Landing Conditions

Bansmann

Kleibert

Bettermann

et al. 2017

Gas‐Phase Synthesis of Nanoparticles

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Influence of substrate and temperature on the shape of deposited Fe, Co, and FeCo nanoparticles

Cited by 8 publications

References 27 publications

Structure, morphology, and magnetic properties of Fe nanoparticles deposited onto single-crystalline surfaces

Structure, morphology, and magnetic properties of Fe nanoparticles deposited onto single-crystalline surfaces

Estudo ab initio de propriedades estruturais e magnéticas de nanopartículas de metais de transição

In‐Flight and Postdeposition Manipulation of Mass‐Filtered Nanoparticles under Soft‐Landing Conditions

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