NANOPARTICLES OF EXOTIC EPSILON-IRON OXIDE (III) AS THE WORKING ENVIRONMENT OF NANOMAGNETIC LOGIC DEVICES
Annotation
Subject of Research.The paper discusses the principles of information processing by nanomagnetic logic devices consisting in the magnetization manipulation of individual magnetic nanoparticles in a single-domain state and combined into a logical network. In a single-domain state, nanoparticles have uniaxial magnetic anisotropy that makes them a bistable system suitable for binary coding of information: the magnetization downwards corresponds to a logical "0", the magnetization upwards is "1". These two states are separated by an energy barrier with the height equal to the energy of the magnetic anisotropy. The logical network in question implies an entirely new way for performing of logical operations. The point at issue is about a network of nanomagnets connected by a dipole interaction and admitting the existence of intermediate frustrated states, analogous to quantum entanglement. Methods. Materials with sufficiently high magnetic anisotropy energy are required for nanomagnetic logic devices to ensure that thermal fluctuations do not lead to orientation loss of magnetic moment and the loss of information. As such, we proposed to use new nanomagnets based on the epsilon phase of iron oxide ε-Fe2O3 with giant magnetic anisotropy. Nanoparticles are produced by a combination of two methods: synthesis in reverse micelles and a sol-gel method. Elemental analysis of nanoparticles was carried out by mass spectrometry with inductively coupled plasma (Agilent Technologies, HP 4500). Photomicrographs were obtained by the JEOL JEM 2000EXII transmission microscope. The structure of nanoparticles is determined by X-ray diffraction on a Rigaku RINT2100 instrument. Study of the magnetic properties was carried out with the use of SQUID magnetometer Quantum Design, MPMS 5XL. Main Results. A new method for performing of logical operations is proposed that consists in the magnetization manipulation of individual nanoparticles not only with the aid of an external magnetic field, but also by varying the temperature of the ε-Fe2O3 nanoparticles under the conditions of a spin-reorientation transition. In the ε-Fe2O3 nanoparticles, a magnetoelectric interaction is discovered that opens new ways for solving the bit state reading problem in the devices under consideration. Experimental conditions for performing of logical operations in ordered arrays of ε-Fe2O3 nanoparticles are created. Practical Relevance. Temperature manipulation by the vector magnetization direction opens up new possibilities for creating devices for nano-magnetic logic and spintronics under conditions of strong anisotropy, when the magnetic fields required to switch the direction of magnetization (and, hence, the change in the bit state) become unacceptably large. The principles discussed in the paper are capable of providing a nondissipative processing of information in the energy limit close to Landauer's estimates, where thermodynamic aspects come to the fore.
Keywords
Постоянный URL
Articles in current issue
- SKIN RESEARCH BY SCATTERING ELLIPSOMETRY
- BRAGG GRATINGS MULTIPUSLE INSCRIPTION EFFICIENCY DEPENDENCE ON ANGULAR POSITION OF ELLIPTICAL STRESS CLADDING IN BIREFRINGENT OPTICAL FIBERS
- DEVELOPMENT AND RESEARCH OF FIBER-OPTIC HYDROPHONE PROTECTIVE HOUSING
- METHOD AND TECHNOLOGY OF DELIVERING OPTICAL RADIATION TO BIOLOGICAL MICRO-OBJECTS
- LED DEVICE FOR PHOTODYNAMIC THERAPY OF ONYCHOMYCOSIS
- TRAJECTORY CONTROL FOR A ROBOT MOTION IN PRESENSE OF MOVING OBSTACLES
- TRACKING AND CLASSIFICATION OF HEAD MOVEMENT BY INERTIAL MEASUREMENT UNIT DATA
- DETERMINATION OF ZONES WITH DIFFERENT CHEMICAL COMPOSITION ON REMOTE SURFACES
- SIMULATION OF INFRARED SPECTRA OF MEDICAL SUBSTANCES BY DIFFERENT QUANTUM MECHANICAL METHODS
- RESEARCH OF “WATER GLASS - GRAPHITE MICROPARTICLES” COMPOSITE MATERIAL BY THERMOGRAVIMETRY METHOD
- STUDY OF PLASMOCHEMICAL PROCESSING EFFECT ON THE PROPERTIES OF POLYMER FILMS BASED ON POLYVINYLCHLORIDE
- ORGANIZATION OF SIMULATION EXPERIMENTS IN THE DESIGN OF DISTRIBUTED COMPUTER SYSTEMS WITH REDUNDANT DATA TRANSMISSION
- METHOD FOR REAL TIME PROCESSING OF OPEN DATA CONTAINING GEOCONTEXT MARKUP
- COOPERATIVE INTERACTION OF EXPERT NETWORKS PARTICIPANTS: STATE-OF-THE ART ANALYSIS
- MULTI-STEP SERVICE OF REQUESTS CRITICAL TO QUEUEING DELAYS IN MULTI-TIER SYSTEMS
- STUDY OF ERRORS OF SOME METHODS FOR SEPARATING OVERLAPPED SPECTRAL LINES UNDER NOISE EFFECT
- DETECTION OF HYDRO-ACOUSTIC COMMUNICATION SIGNAL BY ENERGY ALGORITHM IN LOW FREQUENCY PASSIVE MODE
- FEATURES OF DIFFERENCE SCHEME WITH CUSTOMIZABLE DISSIPATIVE PROPERTIES IN CASE OF TWO-DIMENSIONAL GAS AND GAS-PARTICLE DYNAMICS PROBLEMS
- MODELING OF NON-PLATFORM INERTIAL NAVIGATION SYSTEM AS A COMPONENT OF AIRCRAFT NAVIGATION COMPUTER STAND
- SIMULATION OF CENTRIFUGAL PUMP IMPELLER WITH MAXIMUM CAVITATION EFFECT
- NUMERICAL SIMULATION OF REGULAR AND MACH REFLECTION OF SHOCK WAVE FROM THE WALL
- MODELS AND METHODS OF INFORMATION MANAGEMENT SUPPORT IN CASE OF FINANCE PLANNING
- GENERATION OF SPECTRAL DENSITY MATRICES FOR MULTICHANNEL CONTINUOUS SYSTEMS UNDER WHITE NOISE ACTION
- SEQUENCES OF DIFFERENTIAL INEQUALITIES FOR LYAPUNOV FUNCTIONS IN STABILITY ESTIMATES OF NONLINEAR DYNAMICAL SYSTEMS
- NEW ALGORITHM OF VARIABLE PARAMETERS IDENTIFICATION FOR LINEAR REGRESSION MODEL
- ON FLAME FRONT PROPAGATION RATE IN CYLINDRICAL TUBE WITH MULTIPOINT IGNITION BY STREAMER MICROWAVE DISCHARGE