FeRh/FePt exchange spring films for thermally assisted magnetic recording media

Thiele, Jan-Ulrich; Maat, S.; Fullerton, Eric E.

doi:10.1063/1.1571232

Cited by 420 publications

(279 citation statements)

References 20 publications

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“…Not only does FeRh provide a unique model system for improving our theoretical understanding of ͑sub-͒ps magnetic processes, it also receives considerable interest for its potential application in heat-assisted magnetic recording. 9,10 In this Rapid Communication we provide additional experimental time-resolved magneto-optical Kerr effect ͑TRMOKE͒ data, as well as numerical modeling thereof. The latter accounts for an interplay between laser heating, thermal diffusion, as well as the magnitude and orientation of induced magnetic moments in FeRh thin films after laser irradiation.…”

Section: Identifying Growth Mechanisms For Laser-induced Magnetizatiomentioning

confidence: 99%

Identifying growth mechanisms for laser-induced magnetization in FeRh

Bergman

Hohlfeld

et al. 2006

Phys. Rev. B

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Section: Identifying Growth Mechanisms For Laser-induced Magnetizatiomentioning

confidence: 99%

Identifying growth mechanisms for laser-induced magnetization in FeRh

Bergman

Hohlfeld

et al. 2006

Phys. Rev. B

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“…DOI: 10.1103/PhysRevLett.110.087207 PACS numbers: 75.30.Kz, 75.75.Cd, 81.07.Bc Iron-rhodium alloys exhibit competing ferromagnetic (FM) and antiferromagnetic (AFM) phases with transition temperatures close to ambient for nearly equiatomic composition and body-centered-cubic (bcc) CsCl-like B2 structure. The competition between the two magnetic orders of FeRh holds great potential in spintronics and heat assisted magnetic recording [1,2]. Moreover, the peculiar bulk FeRh magnetic phase diagram enables its use as active material in heat pumps and refrigerators [3][4][5].…”

mentioning

confidence: 99%

“…The competition between the two magnetic orders of FeRh holds great potential in spintronics and heat assisted magnetic recording [1,2]. Moreover, the peculiar bulk FeRh magnetic phase diagram enables its use as active material in heat pumps and refrigerators [3][4][5].…”

mentioning

confidence: 99%

Low Temperature Ferromagnetism in Chemically Ordered FeRh Nanocrystals

et al. 2013

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In sharp contrast to previous studies on FeRh bulk, thin films, and nanoparticles, we report the persistence of ferromagnetic order down to 3 K for size-selected 3.3 nm diameter nanocrystals embedded into an amorphous carbon matrix. The annealed nanoparticles have a B2 structure with alternating atomic Fe and Rh layers. X-ray magnetic dichroism and superconducting quantum interference device measurements demonstrate ferromagnetic alignment of the Fe and Rh magnetic moments of 3 and 1 B , respectively. The ferromagnetic order is ascribed to the finite-size induced structural relaxation observed in extended x-ray absorption spectroscopy. DOI: 10.1103/PhysRevLett.110.087207 PACS numbers: 75.30.Kz, 75.75.Cd, 81.07.Bc Iron-rhodium alloys exhibit competing ferromagnetic (FM) and antiferromagnetic (AFM) phases with transition temperatures close to ambient for nearly equiatomic composition and body-centered-cubic (bcc) CsCl-like B2 structure. The competition between the two magnetic orders of FeRh holds great potential in spintronics and heat assisted magnetic recording [1,2]. Moreover, the peculiar bulk FeRh magnetic phase diagram enables its use as active material in heat pumps and refrigerators [3][4][5].At ambient conditions, bulk B2 FeRh is a G-type AFM with a total magnetic moment on the iron atoms of 3:3 B and no appreciable moment on the rhodium atoms [6][7][8]. Above the transition temperature of 370 K, the atomic moments of Fe and Rh are ferromagnetically aligned and take on total values of 3.2 and 0:9 B , respectively [6][7][8]. While it has long been known that the bcc unit cell volume expands by % 1% upon transforming to FM order [9], recent experiments suggest that distortions of the bcc structure may occur [10]. Given the itinerant character of the 3d electrons, the coupling between crystallographic and magnetic order in this system is both rich and very delicate as demonstrated by the theoretical challenge to model the system [11], as well as by recent pump-probe experiments focusing on ultrafast magnetization control [12].Finite-size systems of this alloy have received particular attention by their potential to stabilize the FM phase at room temperature and below. Strained thin films [13,14] showed traces of a FM phase down to 300 K, while ab initio calculations predicted FM down to 0 K for a Rh-terminated 9 ML FeRh(001) film [15] and for 8-atom FeRh clusters [16]. Indeed, since nanosized crystals may present significantly different interatomic distances and unit cell distortions with respect to bulk [17,18], a fundamentally modified magnetic phase diagram can be expected for FeRh nanocrystals. However, the first experiments on chemically synthesized FeRh nanoparticles (NPs) failed to evidence low temperature stability of the FM phase. Most notably, they raised important questions, such as partial B2 ordering, elemental segregation, and coalescence upon annealing [19][20][21].In this Letter, we demonstrate the persistence of FM order down to below 3 K in size-selected FeRh nanocrystals with a mean d...

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“…5,6 The magnetostructural phase transition is of first order kind with a volume expansion of about 1% when entering in the ferromagnetic phase and a temperature hysteresis of the order of 10 K. 1,[7][8][9] These characteristics make thin films of the FeRh system to present a good potential for applications as micro-electromechanical devices. 10 The study which motivated us, performed in the binary thin film of FePt-FeRh presented in Ref. 10, is, in particular, very interesting.…”

confidence: 99%

Anomalous metamagnetic-like transition in a FeRh/Fe3Pt interface occurring at T ≈ 120 K in the field-cooled-cooling curves for low magnetic fields

et al. 2012

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We report on the magnetic properties of a special configuration of a FeRh thin film. An anomalous behavior on the magnetisation vs. temperature was observed when low magnetic fields are applied in the plane of a thin layer of FeRh deposited on ordered Fe3Pt. The anomalous effect resembles a metamagnetic transition and occur only in the field-cooled-cooling magnetisation curve at temperatures near 120 K in samples without any heat treatment

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FeRh/FePt exchange spring films for thermally assisted magnetic recording media

Cited by 420 publications

References 20 publications

Identifying growth mechanisms for laser-induced magnetization in FeRh

Identifying growth mechanisms for laser-induced magnetization in FeRh

Low Temperature Ferromagnetism in Chemically Ordered FeRh Nanocrystals

Anomalous metamagnetic-like transition in a FeRh/Fe3Pt interface occurring at T ≈ 120 K in the field-cooled-cooling curves for low magnetic fields

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