ABSTRACT
Heating a ferromagnetic material is often perceived as detrimental for most applications. This is indeed the case for modern nano-scaled spintronic devices which are operated solely (at least ideally) by an electric current. Heat is a by-product of the current-driven operation and it deteriorates many functionalities of the device. A large scientific and technological effort is devoted these days to avoid heat in modern magnetic nano devices. Here we show that heat can be used to provide an additional and useful degree of freedom in the control of the local magnetization at the nanoscale. In a ferromagnetic nanowire, temperature is used to induce a magnetic switching through a perfectly deterministic mechanism. The nucleation of the magnetic domain walls that triggers the switching can be achieved at a field considerably smaller than the nucleation field and, importantly, the exact moment of the magnetic switching can be pre-determined with nanosecond precision by controlling the power delivered locally to the switching area. With the help of micromagnetic simulations and a theoretical model, we provide an accurate explanation of how this deterministic thermo-magnetic switching operates. The concepts described in this work may lead to an increased functionality in magnetic nano-devices based on magnetic domain walls.
Subject(s)
Humans , Male , Female , Terminology as Topic , Dictionaries as Topic , Language , Editorial Policies , Primary Health Care/standards , Primary Health CareABSTRACT
No disponible
Subject(s)
Humans , Alzheimer Disease/physiopathology , Family Relations , Caregivers/psychology , Psychic Symptoms , Hallucinations/etiology , Neurobehavioral Manifestations , Social AdjustmentABSTRACT
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Subject(s)
Aged , Humans , Homes for the Aged , Health Programs and Plans , Adaptation, Psychological , Social AdjustmentABSTRACT
El presente artículo tiene por objeto dar a conocer a los cuidadores de enfermos de Alzheimer la utilidad de las técnicas de modificación de conducta. Para ello, se exponen los principios básicos de las mismas, así como las principales técnicas que se pueden utilizar. Posteriormente, se trata, de forma más exhaustiva, algunos problemas específicos, tales como el autocuidado básico, la incontinencia urinaria y los excesos conductuales (agresividad, reacciones catastróficas, delirios, etc). Para finalizar se exponen, brevemente, diversos programas psicoeducativos (AU)
