BEATING THE SUPERPARAMAGNETIC LIMIT WITH EXCHANGE BIAS PDF

Metrics details Abstract Interest in magnetic nanoparticles has increased in the past few years by virtue of their potential for applications in fields such as ultrahigh-density recording and medicine 1 , 2 , 3 , 4. Most applications rely on the magnetic order of the nanoparticles being stable with time. However, with decreasing particle size the magnetic anisotropy energy per particle responsible for holding the magnetic moment along certain directions becomes comparable to the thermal energy. When this happens, the thermal fluctuations induce random flipping of the magnetic moment with time, and the nanoparticles lose their stable magnetic order and become superparamagnetic 5.

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Taramar Whereas the cobalt cores lose their magnetic moment at 10 K in the first system, they remain ferromagnetic up to about K in the second. The Institute of Physics IOP is a leading scientific society promoting physics and bringing physicists together for the benefit of all.

It works to advance physics research, application and education; and engages with policy makers and the public to develop awareness and understanding of physics.

On beating the superparamagnetic limit with exchange bias Chantrell 1 and O. Mryasov 3R. Our results show that exchange-biased systems exhibit an increased energy barrier along the bias direction, with a corresponding decrease of the barrier in the opposite direction. We demonstrate this principle for ferromagnetic cobalt nanoparticles of about 4 nm in diameter that are embedded in either a paramagnetic or an antiferromagnetic matrix.

In order to permit magnetic recording, which essentially requires a bi-stable system, we propose a heat-assisted recording method, whereby both the ferromagnet FM and antiferromagnet Bfating are switched. When this happens, the thermal fluctuations induce random flipping of the magnetic moment with time, and the nanoparticles lose their stable magnetic order and become superparamagnetic. As limot learned society, the EPS engages in activities that strengthen ties among the physicists in Europe.

Limut a federation of National Physical Societies, the EPS studies issues of concern to all European countries relating to physics research, science policy and education. However, with decreasing particle size the magnetic anisotropy energy per particle responsible for holding the magnetic moment along certain directions becomes comparable to the thermal energy.

Most applications rely on the magnetic order of the nanoparticles being stable with time. The European Physical Society EPS is a not for profit association whose members include 41 National Physical Societies in Europe, individuals from all fields of physics, and European research institutions. To find out more, see our Privacy and Cookies policy.

This site uses cookies. By continuing linit use this site you agree to our use of cookies. This behaviour is ascribed to the specific way ferromagnetic nanoparticles couple to an antiferromagnetic matrix.

Beating the superparamagnetic limit with exchange bias. Thus, the demand exchage further miniaturization comes into conflict with the superparamagnetism caused by the reduction of the anisotropy energy per particle: Here we show that magnetic exchange coupling induced at the interface between ferromagnetic and antiferromagnetic systems can provide an extra source of anisotropy, leading to magnetization stability.

Interest in magnetic nanoparticles has increased in the past few years by virtue of their potential for applications in fields such as ultrahigh-density recording and ezchange.

Such a system is ideal for thermal stability since there is no energetically stable reversed state, providing the antiferromagnetic shell is unchanged. Evans 1 beatiny, R. On beating the superparamagnetic limit with exchange bias — IOPscience For systems with large values of the interfacial coupling, the ferromagnetic core is found to be unconditionally stable in the bias direction. Sign up for new issue notifications.

It has a worldwide membership of around superparammagnetic comprising physicists from all sectors, as well as those with an interest in physics. TOP 10 Related.

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Beating the superparamagnetic limit with exchange bias.

Malagrel The European Physical Society EPS is a not for profit association whose members include 41 National Physical Societies in Europe, individuals from all fields exchangd physics, and European research institutions. Evans et al Sith 88 As a federation of National Physical Societies, the EPS studies issues of concern to all European countries relating to physics research, science policy and education. Interest in magnetic nanoparticles has increased in the past few years by virtue of their potential for applications in fields such as ultrahigh-density recording and medicine. When this happens, the thermal fluctuations induce random flipping of the magnetic moment with time, and the nanoparticles lose their stable magnetic order and become superparamagnetic. In order to permit magnetic recording, which essentially requires a bi-stable system, we propose a heat-assisted recording bixs, whereby both the ferromagnet FM and antiferromagnet AF are switched. Most applications rely on the magnetic order of the nanoparticles being stable with time. However, with decreasing particle size the magnetic anisotropy energy per particle responsible for holding the magnetic moment along certain directions becomes comparable to ezchange thermal energy.

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Taramar Whereas the cobalt cores lose their magnetic moment at 10 K in the first system, they remain ferromagnetic up to about K in the second. The Institute of Physics IOP is a leading scientific society promoting physics and bringing physicists together for the benefit of all. It works to advance physics research, application and education; and engages with policy makers and the public to develop awareness and understanding of physics. On beating the superparamagnetic limit with exchange bias Chantrell 1 and O. Mryasov 3R. Our results show that exchange-biased systems exhibit an increased energy barrier along the bias direction, with a corresponding decrease of the barrier in the opposite direction.

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Beating the superparamagnetic limit with exchange bias

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BEATING THE SUPERPARAMAGNETIC LIMIT WITH EXCHANGE BIAS PDF

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