Institute of structure of matter (ISM)

Focus

Ultra-High-Density Magnetic Recording: Storage Materials and Media Designs

2016
Magnetic recording is presently the leading technology for mass data storage. Its dominant role has been reinforced by the success of cloud computing, which requires huge amounts of data to be stored and managed on a multitude of servers. Nonetheless, the hard-disk storage industry is presently at a crossroad as the current magnetic recording technologies are unable to achieve storage densities beyond 1Tbit/in2. Pushing the recording density to the terabit regime requires new storage materials, ...

Formation Mechanism of Silver Nanoparticle 1D Micro- Structures and their Hierarchic Assembly into 3D Superstructures

2009
Flower-like silver nanoparticle microstructures are prepared by the reaction of silver nitrate and ascorbic acid in an acidic aqueous solution of a poly-naphthalene system. The three-dimensional flower-like structure has a purely hierarchic arrangement, wherein each petal is composed of bundles of silver particle chains, each enclosed in a polymer sheath. The ordering arises from strong adsorption of silver ions onto the polymer and by the interplay of the redox properties of nitric and ascorbic ...

Progetto HIDEMAR - Dino Fiorani

2005
Per far fronte alla inarrestabile domanda di immagazzinamento di informazioni nei settori più svariati dell'economia e della società moderna la ricerca scientifica ha prodotto degli sforzi enormi grazie ai quali la densità degli hard disk dei computer è più che raddoppiata ogni anno negli ultimi anni. Purtroppo però la tecnologia esistente ha raggiunto limiti fisici che impediscono la possibilità di immagazzinare sempre più informazioni in spazi sempre più piccoli. Ricorrendo ad una ...

Time-resolved Energy Dispersive X-ray Reflectometry measurements on Ruthenium Phtalocyanine gas sensing films upon working

2003
X-ray Reflectivity (XR) measurements allow an atomic scale determination of the morphological characteristics of thin films, such as their thickness and surface roughness. In the present work, the Energy Dispersive (ED) variant of the conventional XR technique is used in-situ to obtain, for the first time, the (minimal) morphological changes of gas sensing thin films of Ruthenium Phtalocyanine (RuPc)2 upon working. The real-time collection of Reflectivity spectra during the exposure of the films ...

Anisotropy of isolated atoms and nanoclusters of Co

2003
The magnetic anisotropy determines the orientation and the stability of the magnetization which is a crucial parameter for a large part of the technological applications. The possibility of modify the magnetic anisotropy of small clusters by changing the shape, composition and dimensions makes such systems of evident applicative interest. A study of the anisotropy and magnetic momenta of metallic clusters constituted by 1÷100 atoms of Co and deposited onto a crystalline substrate of Pt(111) ...

Optical fibre sensor for NO2 based on metal-phthalocyanines of environmental interest.Patent: International Application N° PCT/ITO1/00005

2002
Optical fibre sensor for NO2 based on metal-phthalocyanines of This project has been developed in collaboration with the IFAC-CNR and with the PRODOTEC srl in the PF MSTA II Introduction Material chemistry and particularly the synthesis and characterisation of new materials is allowing the design and the development of many new chemical sensors which are opening highly exciting perspectives in the area of chemical sensing. The optical fibre sensor for NO2 consists on the utilisation of an ...

Evidence of ferromagnetic order in chains of atoms, Nature 416, 301 (2002)

2002
The fabrication of new nanostructured materials is a rapidly growing field with strong possibilities of applications. Particular attention is actually devoted to overcome the superparamagnetic limit of nanoparticles by means of the controlled manipulation of the shape and magnetocrystalline anisotropies and to the development of composite elements for magnetic memories and sensors. The activity of the institute in that field is specifically dedicated to the synthesis and to investigate the ...