Recent Progress of Basic Technology for Ultra High-Density Heat Assisted Magnetic Recording Storage devices, especially hard disk drives (HDDs), are remarkably improved these days. HDDs are applied to video recorders, mobile audio-visual systems, car navigation systems, and computer storage systems. A variety of those applications is spreading out further, so there is a big demand on improvement for HDDs of high density and large capacity, but the technical barriers are being pushed higher and higher. In these backgrounds, fundamental research of heat assisted magnetic recording has been progressed recently for making new breakthroughs. In this topical symposium, we invited active researchers in the field of hybrid recording. Recent topics for […]

The physical properties and applications on Mn group materials Mn takes various ion states in 3d transition metals, and it is known that it shows nature of magnetism peculiar by the spin state. We planned a broad study introduction and recruited the latest topic for the field in a key word with Mn. An alloy and a compound including Mn, show various magnetism, and a Mn molecule magnet, the diluted magnetic semiconductor which added Mn in an III-V semiconductor, new possibility are expected to a ferroelectric magnetic device by commensurate anti-ferromagnetism of a perovskite type Mn oxide. We introduce the latest studies from the basics to realize such Mn magnetism […]

Innovative Trends of Microwave Ferrite Devices and Expectation for the New LH-materials In 1956, the paper by C.L.Hogan,” The Elements of Nonreciprocal Microwave Devices” (IRE proc.,Vol.44, Oct.1956,pp.1345-1368), was published. Since then, during a half century, “Circulator/Isolator” has become an indispensable component for microwave communication systems such as TV broadcasting base station, wireless systems for business and emergency, and recent mobile phone systems. Especially, here in Japan, the lumped element isolator has been uniquely developed, following the early research by the pioneer, Dr. Konishi. One of the great achievements of the last decade is the miniaturization of small isolator for mobile phone handsets. The 4mm square isolator has already been realized […]

The magnetization reversal for various actions The magnetization reversal is the most basic function of the magnetic materials, and the control of the magnetization reversal is important to improve the performance of magnetic devices. In these days, causing the magnetization reversal by various actions other than the magnetic field becomes possible, and it is expected to be a new way of the control technology for the magnetization reversal. In this topical symposium, invited lecturers active in the first front of the related field will give the talks for novel research relating the magnetization reversal due to various actions. We try to plan this symposium for a wide researching field, and […]

Recent Trend of Rare Earth Magnets and their Applications Nd-Fe-B magnets have been developed by remarkable growth in electronic industry. The main applications of Nd-Fe-B magnets were voice coil motors and spindle motors in hard disk drives (HDD) at the beginning. It’s more than 20 years since the Nd-Fe-B magnets were invented, which have been extending their applications such as MRI, home appliances, wind power generation, industrial motors, and traction motors for rail vehicle and HEV. The 147th Topical Symposium of Magnetics Society of Japan aims at reviewing the recent trend of rare earth magnets and their applications to inspire further development. We sincerely appreciate participation of researchers and engineers who […]

Fundamental and Recent Progress of L10 Ordered Magnetic Alloys Recently, L10-type FePt and CoPt ordered magnetic alloys are attracting much attention as “high anisotropy nano-magnetic materials” and their applications are expected in magnetic recording materials and thin film magnets. Historically, these materials were discovered as permanent magnets in the 1930s, and various aspects, i.e. magnetism, magneto-optical properties, ordering transformation, and microstructures, have been studied, which lead to the basis of today’s research and development for the advanced magnetic materials. In this symposium, we have invited active authorities in such fundamental fields and will discuss their potential applications based on the particular properties of the L10-type ordered alloys. We very much look forward to […]

The forefront of Spin-current-driven devices Spin-current -driven devices are an attractive research topic in magnetic devices because they have the high potential of active devices, such as spin transistor and spin diode. In addition, they will change the recording mechanism of the high density magnetic memories. In this symposium, we will focus on the recent research on spin current driven magnetic phenomena and its’ potential to the devices. We have invited a number of active researchers in this field. They will inform us of the latest research achievements and discuss the Spin-current-driven devices. We very much look forward to your participation. Date: January 30, 2006 (Monday) 9:30 – 17:40 Place: […]

Perpendicular Recording, which greeted a stage of practical use Recent remarkable improvement in hard disk technology has enlarged its applications into video recorders, mobile audio-visual systems and car navigation systems beyond computer storage. Especially, higher recording density and larger capacity are required to satisfy the demands of audio-visual systems. Perpendicular recording is one of the break-through to achieve the demands. Mobile audio players using Perpendicular Recording. Hard Disk Drive (HDD) was shipped in the market recently. Perpendicular Recording technology has been in a stage of practical use. In this topical symposium, recent improvements of Perpendicular Recording technologies in media, head and drive will be reported. Not only people in HDD […]

Technologies for Development of High Performance Electric Motors and their Applications In recent years, demands for high efficiency and performance of electric motors become higher for an environmental problem, an electric vehicle, and a high precision fabrication, and so on. In order to develop high performance motors, magnetic materials such as an iron core and a permanent magnet, and numerical techniques for design have been remarkably progressed, and high performance motors have been realized. In this symposium, the recent topics on technologies for development of high performance electric motors and their applications are presented by solicited speakers. Namely, the recent trends of magnetic materials and numerical techniques are explained. Moreover, […]

Micro actuators with small permanent magnets Since the 1990’s, there have been increased activity on developments in micro actuators with utilizing microprocessing and MEMS technologies. They look unrelated to magnetics because electrostatic or piezic force is applying to power sources for almost of all micro actuators with dimensions of micron order. However, considerably high output by electromagnetic force has been expected for milli- or sub-milli-sized actuators which may be more important from the point of view of practical usage. The 142nd Topical Symposium of Magnetics Society of Japan aims at reviewing the advantages of electromagnetic force for such micro actuators, examples of them, small motors, and miniaturization of permanent magnets […]