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Since 2009 the read heads of all hard disks have used a technology based on magnesium oxide (MgO). The development of this technology can be partly attributed to a 2001 publication [3.1] co-authored by Dr Andrey Umerski of The Open University, which concluded that a system based on MgO would lead to a huge increase in magnetoresistance, a physical property that determines the efficiency of hard disk read heads.
In 2004 these theoretical predictions were confirmed experimentally; by 2008 the new type of read head based on MgO was manufactured commercially, leading to significant increases in storage capacity, from GBs to TBs.
The significant increase in hard disk storage capacity in the last few years can be in part attributed to theoretical research in Mathematics undertaken at City University London. A material or device is said to exhibit the property of magnetoresistance if its electrical resistance changes when the direction of an external magnetic field is varied. The work undertaken at City concluded that devices based on magnesium oxide (MgO) would exhibit magnetoresistances very much larger than previously observed. In 2004 these conclusions were confirmed experimentally. By 2008 a new type of disk read head (the device that senses data on a magnetic disk) based on this structure was being manufactured commercially, enabling a significant increase in hard disk storage capacity. Today all computer hard disks use read heads based on this technology in an industry with 2012 sales exceeding $28 billion. The increase in hard disk storage capacity achieved (from gigabytes to terabytes: 1 terabyte = 1,000 gigabytes) and the consequent improvement in disk performance for users can be partly attributed to the City research.
A device developed for spintronics research at the University of Oxford has been adapted as the basis for robust, high-performance position or composition sensors to detect many different materials including metals, plastics, ceramics and fluids. These sensors are capable of making contactless measurements in very hostile environments. A spin-out company was formed in 2004 to exploit and apply this technology to a wide range of technical and engineering problems and has achieved over £2.5m revenue. These sensors form the key elements of products that have been successfully deployed in automotive and other transport applications. Benefits to end users include ease of use, speed and the cost savings.
A software package called CPO has been developed that simulates the motion of charged particles in electromagnetic fields. More than 200 benchmark tests have established CPO as the gold standard in low-energy charged-particle optics. A spin-off company was formed to market CPO, [text removed for publication]
Heat capacity is the measurable physical quantity that specifies the amount of heat required to change the temperature of an object or body by a given amount and is an important quantity to establish in any application that requires knowledge of the thermal response of a material. It is quite usual in the development of new materials that the volume of material available in single crystalline form is limited, and the ability to measure small samples sensitively has particular importance for this reason. We claim a dominant influence on the design of an ultrasensitive heat capacity microcalorimeter that is now sold by the UK company Cryogenic Ltd as a heat capacity option for their cryogenic measurement systems. The microcalorimeter makes it possible to measure ultra-small samples, particularly magnetic samples that are invisible to other commercial probes. Research was carried out within Imperial's Physics Department in 2003-04 to develop the instrumentation; the design was published in 2005 after which it transferred to UK company Cryogenic Ltd. In the past three years the approximate total sales of the heat capacity option at Cryogenics amount to £500K, as a valuable component of a physical properties measurement system with a total sale value in the region of £2M [section 5, source E].
Research in the Microelectronics Group of the Cavendish Laboratory in the area of single-electron nanoelectronics, quantum computing and spintronics has been exploited by Hitachi, one of world's leading microelectronics companies. Research breakthroughs made in the Cavendish have defined Hitachi's R&D directions in quantum computing and spintronics, led to several Hitachi product developments and influenced senior Hitachi strategic decision makers regarding the future of computing.
Research at the University of Cambridge, Department of Physics on sensitive techniques for measurements of magnetic and electrical properties of materials led to the selection of Dr Michael Sutherland as an expert witness in a series of major police investigations involving fraudulent bomb detecting equipment. Scientific evidence Dr Sutherland presented in court was key in securing guilty verdicts, leading to the breakup in 2013 of several international fraud rings with combined revenue in excess of £70 million. This criminal activity had caused significant damage to the reputation of the UK in Iraq and elsewhere.