Manipulating Magnetism for Future DataStorage Devices

first_img Light may increase magnetic memory speeds 1000 times, decrease electricity consumption Citation: Manipulating Magnetism for Future Data-Storage Devices (2007, April 30) retrieved 18 August 2019 from https://phys.org/news/2007-04-magnetism-future-data-storage-devices.html In an important step toward future data-storage technologies based on magnetism, a research group has determined how to control the magnetization of a “magnetic vortex,” a curling nanometer-sized magnetic structure present within tiny, millionth-of-a-meter-sized magnetic disks. Understanding the behavior of this type of structure is one of the main requirements of magnetic data-storage development. A graphical representation of the magnetization of a magnetic disk with a rotating vortex. a-f, Over a time period of about 20 nanoseconds, the magnetization of the core (represented by the spike in the center of the disk) moves circularly around the disk´s center. Simultaneously, the magnetization switches from upward to downward and begins to switch back to upward. This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. The group, led by scientists at Kyoto University in Japan, found a way to manipulate the magnetization of the vortex’s core without applying an external magnetic field to the disk. Instead, they applied a current.“We have taken advantage of the way the vortex responds to an applied current,” said corresponding Kyoto University scientist Teruo Ono to PhysOrg.com. “A current of the right strength resonates with the vortex, causing it to rotate at a high speed – several hundred meters per second. This motion produces a strong dynamic magnetic field that opposes the vortex’s own magnetization, and reverses it.”Although the applied current is electrical in nature, being based on electrons, it isn’t a stream of moving electrons. It is a “spin current,” a stream of moving spins. Spin is an intrinsic property of electrons that essentially imparts them with a tiny magnetic field, or magnetic “moment,” pointing either up or down. If several electrons are placed in a row, a spin can propagate down the line; many propagating spins produces a spin current.Across the globe, teams of researchers are working to build viable spin-based electronic devices – spintronics – using spin currents. This group’s work opens the possibility that simple magnetic disks can serve as the building blocks for spintronic devices like memory cells, where each bit of information would be stored as the direction of the vortex-core’s field. Vortex-core switching could be an efficient way of writing data to a memory device.The physics underlying this result is the tension created between the spin direction of the conduction electrons and the direction of the individual magnetic moments that make up the overall magnetic field of the vortex core. When they are positioned relative to each other at a specific angle, the spin current applies a torque to each moment, forcing the whole core to rotate.“This spin-transfer effect liberates us from having to apply a large external magnetic field in order to control magnetic devices, which means we can avoid the expense and effort required to maintain such large fields,” Ono added.This research is described in the March 18, 2007, online edition of Nature Materials.Citation: Keisuke Yamada, Shinya Kasai, Yoshinobu Nakatani, Kensuke Kobayashi, Hiroshi Kohno, André Thiaville, and Teruo Ono, Nature Materials advance online publication, 18 March 2007 (DOI 10.1038/nmat1867)Copyright 2007 PhysOrg.com. All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of PhysOrg.com. Explore furtherlast_img read more

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KMC looks to get cooperation of Kolkata Police in tackling dengue

first_imgKolkata: The Health department of Kolkata Municipal Corporation (KMC) will soon hold a meeting with Kolkata Police seeking the latter’s cooperation over conducting drives against vector-borne diseases in locked buildings.”Section 546 of the KMC Act empowers the commissioner to take up drives in buildings under lock and key for a long period of time by breaking open the lock , if the civic body feels that the building may have turned into a breeding ground for mosquitoes. However, in certain parts of the city, there have been lack of cooperation on the part of the police which has acted as a hindrance in such drives. We will soon hold a meeting with the top brass of the police to ensure proper support in this area,” a senior official of KMC’s health department said.Member Mayor-in-Council (Health) Atin Ghosh chaired a meeting on the present situation of dengue drives in the city and what measures need to be taken to clear impediments, if any for conducting drives smoothly. It is learnt that Ghosh had said in the meeting that he may take up the matter with Police Commissioner Rajeev Kumar if such non cooperation continues after some councillors pointed out their difficulties in holding drives at locked building premises. As per section 546, KMC after breaking the lock will conduct cleanliness drive in the building and will then put the same under a new lock and key and the key will handed over to the officer-in-charge of the police station under which the building falls. KMC has been holding such meetings at regular intervals at the borough level to ensure that dengue drive and awareness campaigns gain momentum.”We have also found out that a number of condemned buildings of the railways in the city are under lock and key and drives need to be conducted there immediately,” the senior official said.KMC will also hold meetings with representatives from apartments in the city urging them to keep their premises clean. “There are also problems with some business establishments who are doing business but have not put in place any drainage or conservancy measures in place,” he maintained.”It is true that the number of dengue cases has been much less in comparison to the previous year. However, there is no place for complacency,” the official added.last_img read more

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Artwork that charts the trajectories of mind

first_imgA solo show titled ‘Metaphors of the Moon’ will be presented by Studio Adda at the Lalit Kala Akademi from May 11- 17. The present series of the paintings, Metaphors of the Moon, chart the trajectories of the mind as it travels from absence to presence in a cyclic repetition. The mind is the metaphor for the Moon. It represents the cyclic process of thought, its creation, immersion and regeneration. The lessons of the Moon are about the fragility of reconciliation and the assurance of restoration. Also Read – Add new books to your shelfThe paintings are a visualization of the individualized collective mind that embraces the one and the infinite, with the same ease as it deals with universal pain, suffering and loss. The mind engages naturally with the task of the larger and impersonal, rather than the smaller and personal. Like the Moon, the mind too reduces itself to fit the mortal world. The mind binds itself to the temporal, despite the knowledge of its timelessness, and expanse. Also Read – Over 2 hours screen time daily will make your kids impulsiveKota Neelima’s paintings for the past decade have been inspired by the questions of existence and creation andexplored the healthy tradition of doubt and scepticism in Indian philosophical thought. Her worksinterrogate the concepts of creation, causation and karma, as paths of reconciliation.Drawing from her study of the Upanishads, and her own understanding of contemporary India as an author about poverty and spirituality, Neelima’s works are part of public and private spaces in India and other countries, including the Museum of Sacred Art in Belgium.last_img read more

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Use Technology to Foster Collaboration in Your Office

first_imgOctober 15, 2015 Growing a business sometimes requires thinking outside the box. 5 min read Free Webinar | Sept. 9: The Entrepreneur’s Playbook for Going Global Avoiding a generational divide in the workplace requires a systemic approach to collaboration, one that values inputs from all, appreciates and respects the contributions of everyone, is seamless to the business and is easy to use.The processes needed to build out a more collaborative office don’t necessarily change from what you have experienced in the past, but the tools and technology that enable collaboration certainly have.  Related: When Overcommunicating Can Do More Harm Than GoodMake use of new — and old — interfaces.The advent of new technologies has opened the office up to collaboration that extends beyond a simple phone call or email. New interfaces allow for instant video chat. Twitter feeds and hash tags can be built in support of new projects or products. Interactive and cloud-based guides can allow planners to adjust in the moment and send out instantaneous updates to all affected parties.As technologies continue to advance, so does the opportunity to collaborate more effectively in the workplace. That said, there’s still nothing better than true, face-to-face communication. The new technologies shouldn’t be seen as tools that subvert traditional communication patterns, but rather as ways to complement them. You don’t have to be a tech wizard.Less technical employees need not to worry. Technologies available to us that can help extend collaboration efforts are fairly intuitive. The idea of the millennial as a technical wizard, in most cases, is really less about them being highly technical and more about the technologies being highly intuitive. The interfaces have become simple. It’s just a matter of practice. Hand a 3-year-old an iPad and watch with amazement how easily they can navigate the device.The new collaboration tools in the market make using their technology simple. Take the new start-up, High Five. They promise to simplify the way we interact with one another at work. Still in beta-testing, High Five promises to disrupt the existing collaboration tool set in our workplace. Imagine emails, instant messaging and video conferencing all in one easy-to-use interface that requires little more than knowing a URL and having an understanding of how to plug in a USB cord.  Related: Slack 101: How and Why to Create a Community on This PlatformThis type of technology is simple and easy to use. It’s a way to bring collaboration to the forefront of all that you do in the workplace, and it’s critical to how we can collaborate across generations, in a seamless, easy-to-use way. Technology continues to change our landscape, but it’s not enough to just implement the tools and walk away.  Establish protocol to embed new technology.Building a collaborative work environment requires the right processes and the right people. It’s easy to make assumptions about technology as the saving grace and in many cases it can be, but it’s not simply enough to put technology in place and walk away from the structural support needed to embed the technology into the culture of the organization. Establishing clear processes and protocol for how interactions happen and encouraging employees to set ground rules for one another about how they prefer to collaborate is a first step. As you certainly know, not everyone chooses to collaborate in the same manner. Some people prefer face-to-face meetings to discuss any relevant issues, and others would prefer to be left alone and handle all communications through email and / or text messaging. Evaluate performance expectations and rewards.Looking at your policies in regards to performance expectations and rewards can also help foster collaboration across generations. There’s a lot of wisdom and knowledge embedded in organizations, only most of it is hidden from view. Most of it becomes tribal knowledge, learned by doing, failing, and doing again.When the boomer generation walks out the door for retirement, how much of their tribal knowledge has been passed down to the younger generations? Are you actively working to collect what they know, are you encouraging them to share it? There are tools that can help you do this. Collaboration is key to working across generations, and new intuitive technologies can simplify how we collaborate with one another, but they’re only effective if you have the policies, processes and people in place to make them work. Buying new technology in the hopes of making your workplace more collaborative without appropriate structural support is like flushing money down a toilet.Put the right support in place and watch the collaboration grow. It’s not rocket science, but it certainly takes time and effort to make it happen.  Related: 4 Business Meetings You Should Never Take Opinions expressed by Entrepreneur contributors are their own. Register Now »last_img read more

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