Dynamics of Electrically Driven Martensitic Phase Transitions in Fe Nanoislands

Gerhard, Lukas; Wesselink, Rien J. H.; Ostanin, Sergej; Ernst, A.; Wulfhekel, Wulf

doi:10.1103/physrevlett.111.167601

Cited by 9 publications

(12 citation statements)

References 20 publications

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“…The plot of the residence times of the hcp state is depicted in Fig. 4d) and shows an exponential decay with a lifetime τ f cc of about 0.3 s. In analogy to our experiments on Fe/Cu(111) reported in 16 , this can be explained by a thermally activated transition between two local energy minima (see inset in Fig. 4d).…”

supporting

confidence: 75%

“…The slope of the linear fit gives the critical value of the electric field of about 10 GV /m (see Fig.3e)). This value is about one order of magnitude larger than the electric fields needed for MEC in 2 ML Fe/Cu(111) 3,16 . These high electric fields require a very stable configuration of the tip apex.…”

mentioning

confidence: 83%

“…3e)). This value is about one order of magnitude larger than the electric fields needed for MEC in 2 ML Fe/Cu(111) 3,16 . These high electric fields require a very stable configuration of the tip apex.…”

mentioning

confidence: 83%

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Electric-field-induced switching from fcc to hcp stacking of a single layer of Fe/Ni(111)

2015

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We present a detailed study of an electric-field induced phase transition of a single layer of Fe on a Ni(111) substrate. Scanning tunneling microscopy at 4 K substrate temperature is used to provide the necessary electric field and to follow the transition from face-centered cubic to hexagonal closepacked stacking with atomic resolution.The concept of electric-field induced switching of magnetic metallic nanosystems is of particular interest in the view of potential applications in data storage devices and led to a tremendous increase of research activities during the last few years 1-5 . In the case of 2 ML Fe islands on Cu(111), it has been shown that a martensitic phase transition between ferromagnetic body-centered cubic(bcc) and antiferromagnetic facecentered cubic (fcc) phases is induced upon application of high electric fields. Herein, the coexistence of two different crystallographic phases and the complex magnetic order are closely interwoven 3,6 . Considering the interatomic distances between nearest neighbors d nn and the resulting lattice mismatch, a Ni (111)

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confidence: 75%

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confidence: 83%

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Electric-field-induced switching from fcc to hcp stacking of a single layer of Fe/Ni(111)

2015

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“…Energy landscape concepts in martensites are used in other contexts [27][28][29][30][31][32] . In perovskite manganites, the straininduced metal-insulator phase coexistence is understood through an elastic energy landscape 27 .…”

Section: Energy Landscape Conceptsmentioning

confidence: 99%

“…In a binary alloy system, the crystallization of strain glass and it's properties are studied using frustrated free-energy landscape 28 . In iron nanoislands system, an energy landscape is modeled to study the dynamics of electrically driven bodycentered cubic to face-centered cubic phase transition 29 . In a single crystal, Peierls-Nabarro energy landscape is used to model cubic-monoclinic transition 30 .…”

Section: Energy Landscape Conceptsmentioning

confidence: 99%

Golf-course and funnel energy landscapes: Protein folding concepts in martensites

Shankaraiah

2017

Phys. Rev. E

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We use protein folding energy landscape concepts such as golf-course and funnel to study reequilibration in athermal martensite parameter regime of triangle-to-centered rectangle, squareto-oblique, and triangle-to-oblique transitions under systematic temperature-quench Monte Carlo simulations. On quenching below a transition temperature, the seeded high-symmetry parent-phase austenite that converts to the low-symmetry product-phase martensite, through autocatalytic twinning or elastic photocopying, has both rapid conversions and incubation-delays in the temperaturetime-transformation phase diagram. We find the rapid (incubation-delays) conversions at low (high) temperatures arises from the presence of large (small) size of golf-course edge that has funnel inside for negative energy states. In the incubating state, the strain structure factor enters into the Brillouin zone golf-course through searches for finite transitional pathways which closes off at the transition temperature with Vogel-Fulcher divergences that are insensitive to Hamiltonian energy scales and log-normal distributions, as signatures of dominant entropy barriers. The crossing of the entropy barrier is identified through energy occupancy distributions, Monte Carlo acceptance fractions, heat emission and internal work. The above ideas had previously been presented for the scalar order parameter case. Here we show similar results are also obtained for vector order parameters.

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Multiferroic Heterostructures Integrating Ferroelectric and Magnetic Materials

2015

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Multiferroic heterostructures can be synthesized by integrating monolithic ferroelectric and magnetic materials, with interfacial coupling between electric polarization and magnetization, through the exchange of elastic, electric, and magnetic energy. Although the nature of the interfaces remains to be unraveled, such cross coupling can be utilized to manipulate the magnetization (or polarization) with an electric (or magnetic) field, known as a converse (or direct) magnetoelectric effect. It can be exploited to significantly improve the performance of or/and add new functionalities to many existing or emerging devices such as memory devices, tunable microwave devices, sensors, etc. The exciting technological potential, along with the rich physical phenomena at the interface, has sparked intensive research on multiferroic heterostructures for more than a decade. Here, we summarize the most recent progresses in the fundamental principles and potential applications of the interface-based magnetoelectric effect in multiferroic heterostructures, and present our perspectives on some key issues that require further study in order to realize their practical device applications.

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Dynamics of Electrically Driven Martensitic Phase Transitions in Fe Nanoislands

Cited by 9 publications

References 20 publications

Electric-field-induced switching from fcc to hcp stacking of a single layer of Fe/Ni(111)

Electric-field-induced switching from fcc to hcp stacking of a single layer of Fe/Ni(111)

Golf-course and funnel energy landscapes: Protein folding concepts in martensites

Multiferroic Heterostructures Integrating Ferroelectric and Magnetic Materials

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