Magnetic and Semiconductor Nanostructures for Ultra High Density Magnetic Recording

Event Date: April 17, 2008
Speaker: Ernesto Marinero
Speaker Affiliation: Hitachi San Jose Research Center
Sponsor: Nanotechnology Seminar Series
Time: 10:00 AM
Location: Birck Nanotechnology Center, Room 1001
Contact Name: Tim Sands
Contact Phone: (765) 494-3509
Contact Email:
Open To: Acceptable for ECE694A


Magnetic recording aims to achieve recording densities of ≥ 1012 bits/in 2 in the foreseeable future. Critical dimensions of the magnetic domains and the sensors required to detect their flux at this density will be of the order of 15 nm or less. These nano-scale dimensions present major materials and fabrication challenges to both the magnetic materials utilized for storing the bits, and to the sensor devices.

This talk will review ongoing efforts to achieve highly uniform nanostructured magnetic recording materials comprising magnetic grains (islands) of  ≤ 5 nm in diameter, segregated by a secondary non-magnetic phase. 

Mesoscopic sensors based on GMR and TMR based ferromagnetic materials are expected to be inadequate for sensing magnetic domains ≤ 15 nm on account of thermal instabilities (mag noise) and spin-torque effects. Therefore, magnetic sensor devices employing non-ferromagnetic materials are needed. Nanoscopic semiconductor quantum well heterostructures offer a potential solution and I will describe our ongoing research in this area.

Ernesto Marinero received his BSc and PhD degrees in Physics from Heriot-Watt University, Edinburgh, United Kingdom. His research experience has been gained through various appointments in Europe and the USA. This includes basic and applied research at the Max Planck Institute in Goettingen, Germany; Stanford University and the IBM and Hitachi Research Centers in San Jose, California.

His technical expertise includes Materials Science, Semiconductor Physics, Growth of Nanostructured Materials and Thin Films, Laser Physics and Picosecond Phenomena, Laser-Materials Processing, Atomic and Molecular Spectroscopy, Hydrogen Quantum Chemistry, Optoelectronics, Characterization and Metrology, Thin Film Corrosion and Reliability, Magnetic Materials and Magnetic Recording Technology, Phase-Change Storage and Nanoscale Sensor Device Physics and Fabrication. His work has been widely published in the scientific literature and utilized in IBM's and Hitachi’s technology products. His original research is the subject of numerous US, Asian and European patents.

Marinero is currently at the Hitachi San Jose Research Center and his research focuses on two key areas: 1) synthesis of new nanostructured magnetic materials that and 2) research on electron transport of mesoscopic devices based on semiconductor 2DEG heterostructures with particular emphasis on ballistic transport and quantum transport. He is actively involved in collaborative research programs with academic institutions in the USA, Mexico and the UK through joint research programs in nanoscience and nanotechnology.