APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

19 Apr 2010

Volume 96, Issue 16, Articles (16xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 96, 163101 (2010); http://dx.doi.org/10.1063/1.3327831 (3 pages)

Ramesh Nath, Seungbum Hong, Jeffrey A. Klug, Alexandra Imre, Michael J. Bedzyk, Ram S. Katiyar, and Orlando Auciello
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Interactions between 180° and 360° domain walls in magnetic multilayer stripes

Mark D. Mascaro, Chunghee Nam, and C. A. Ross

Appl. Phys. Lett. 96, 162501 (2010); http://dx.doi.org/10.1063/1.3396076 (3 pages) | Cited 8 times

Online Publication Date: 20 April 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Magnetostatic interactions between 360° and transverse 180° domain walls in the NiFe and Co layers of Co/Cu/NiFe multilayer stripes are investigated by micromagnetic simulations. In 200 nm wide Co (5 nm)/Cu (5 nm) /NiFe (5 nm) stripes, stray fields from 360° domain walls in the Co layer strongly influence the magnetic behavior of the NiFe layer, promoting reverse domain nucleation and providing a pinning potential of order 100 Oe which impedes domain wall propagation. 360° domain walls may be useful as programmable pinning sites in magnetoelectronic logic or memory devices.
Show PACS
75.60.Ch Domain walls and domain structure
75.78.Cd Micromagnetic simulations
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
68.65.Ac Multilayers
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

Exchange bias in spin glass (FeAu)/NiFe thin films

Fu-Te Yuan, Jeng-Kai Lin, Y. D. Yao, and Shang-Fan Lee

Appl. Phys. Lett. 96, 162502 (2010); http://dx.doi.org/10.1063/1.3399780 (3 pages) | Cited 7 times

Online Publication Date: 20 April 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The exchange bias of a ferromagnet in contact with a spin glass is evidenced in the sputter deposited (Fe 9.6 at. % Au)/NiFe bilayers. The biasing field decreases as temperature increases, change the sign after reaching a compensation temperature (To), and are reduced to zero at higher temperatures. Furthermore, To decreases with the decreasing FeAu layer thickness. Likewise, the inverse bias decreases with the increasing maximum field of a hysteresis loop. A spin structure model is suggested to explain our data. The results confirm the robust nature of the inverse bias in spin glass/ferromagnetic structure and reveal distinct physics from conventional antiferromagnetic/ferromagnetic systems.
Show PACS
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.30.Et Exchange and superexchange interactions
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Lk Spin glasses and other random magnets
75.50.Bb Fe and its alloys

Magnetization plateau and incommensurate spin modulation in Ca3Co2O6

Yang Zhao, Shou-Shu Gong, Wei Li, and Gang Su

Appl. Phys. Lett. 96, 162503 (2010); http://dx.doi.org/10.1063/1.3413931 (3 pages) | Cited 3 times

Online Publication Date: 21 April 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The magnetic properties of a trigonal prism unit of the spin-2 frustrated compound Ca3Co2O6 are studied by means of the density-matrix renormalization group method. A magnetization plateau at ms/3 (ms is the saturation magnetization) with ferrimagnetic structure is observed. By fitting the experimental data of magnetic curve, an estimation of the couplings gives J1 = −26.84 K, J2 = 0.39 K, and J3 = 0.52 K. The local magnetic moments are unveiled to exhibit an incommensurate sinusoidally modulation along the three chains of the trigonal prism, which gives a strong theoretical support to the experimentally observed incommensurate partially disordered antiferromagnetic state for Ca3Co2O6. The present result suggests that the modulation indeed originates from the competition of antiferromagnetic and ferromagnetic couplings.
Show PACS
75.10.Jm Quantized spin models, including quantum spin frustration
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Et Exchange and superexchange interactions
75.50.Ee Antiferromagnetics
75.20.Hr Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions
75.50.Gg Ferrimagnetics

(Fe,Si,Al)-based nanocrystalline soft magnetic alloys for cryogenic applications

Maria Daniil, Michael S. Osofsky, Donald U. Gubser, and Matthew A. Willard

Appl. Phys. Lett. 96, 162504 (2010); http://dx.doi.org/10.1063/1.3402775 (3 pages) | Cited 5 times

Online Publication Date: 21 April 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
In this work Al and Si are substituted for Fe in a (Fe,Si,Al)–Nb–B–Cu alloy with the goal of improving its magnetic properties at 77 K. The x-ray diffraction patterns for a series of five alloys annealed at 823 K shows a Fe3(Si,Al) ordered phase with some residual amorphous phase. The lowest coercivity at room temperature was observed for the alloy with composition Fe68Si15.5Al3.5Nb3B9Cu1. At cryogenic temperatures, the saturation magnetization of 99.3 A m2/kg, coercivity of 0.45 A/m, and resistivity of 122 μΩ cm for the Fe63Si17.5Al6Nb3B9Cu1 alloy, compare favorably to commercial alloys at 77 K.
Show PACS
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
81.40.Gh Other heat and thermomechanical treatments
75.50.-y Studies of specific magnetic materials

A magnetoelectric memory cell with coercivity state as writing data bit

Zheng Li, Jing Wang, Yuanhua Lin, and C. W. Nan

Appl. Phys. Lett. 96, 162505 (2010); http://dx.doi.org/10.1063/1.3405722 (3 pages) | Cited 7 times

Online Publication Date: 21 April 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Commercial magnetic recording media employ magnetic-field-induced two different magnetization states ±M to write data. In this paper, we present a magnetic memory cell in which electric-field-induced two different coercive-field Hc states (i.e., low-Hc and high-Hc) rather than ±M are served as writing data bits. A multiferroic magnetoelectric bilayer with Fe0.93Ge0.07 film grown on fully poled ferroelectric BiScO3-PbTiO3 substrate, exhibiting a large electric-field modulation of Hc, is used for illustration of such a prototype electric-write/magnetic-read memory cell which is nonvolatile. The reading process of the different coercive-field Hc information written by electric fields is demonstrated by using magnetoresistance read head.
Show PACS
85.70.Li Other magnetic recording and storage devices (including tapes, disks, and drums)
85.70.Kh Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.
85.75.Bb Magnetic memory using giant magnetoresistance
77.55.Nv Multiferroic/magnetoelectric films
75.85.+t Magnetoelectric effects, multiferroics
77.80.-e Ferroelectricity and antiferroelectricity

Optimal time-dependent current pattern for domain wall dynamics in nanowires

P. Yan and X. R. Wang

Appl. Phys. Lett. 96, 162506 (2010); http://dx.doi.org/10.1063/1.3413951 (3 pages) | Cited 2 times

Online Publication Date: 22 April 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Optimal current pattern for domain wall (DW) dynamics in nanowires is investigated. Based on the modified Landau–Lifshitz–Gilbert equation with both the Slonczewski spin-transfer torque and the fieldlike torque, the optimal current pattern for either the maximal DW propagation velocity or the maximal DW-motion-induced spin electromotive voltage is found. Possible experimental realizations are discussed.
Show PACS
75.60.Ch Domain walls and domain structure
75.75.Fk Domain structures in nanoparticles
75.50.Tt Fine-particle systems; nanocrystalline materials
75.75.-c Magnetic properties of nanostructures
75.30.Ds Spin waves
Author Select

From single- to double-first-order magnetic phase transition in magnetocaloric Mn1−xCrxCoGe compounds

N. T. Trung, V. Biharie, L. Zhang, L. Caron, K. H. J. Buschow, and E. Brück

Appl. Phys. Lett. 96, 162507 (2010); http://dx.doi.org/10.1063/1.3399774 (3 pages) | Cited 18 times

Online Publication Date: 22 April 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Substitution of some Cr for Mn atoms in MnCoGe was employed to control the magnetic and structural transitions in this alloy to coincide, leading to a single first-order magnetostructural transition from the ferromagnetic to the paramagnetic state with a giant magnetocaloric effect observed near room temperature. Further increase in the Cr content in the Mn1−xCrxCoGe alloys can induce another first-order magnetoelastic transition from the antiferromagnetic to the ferromagnetic state occurring at lower temperature. The giant magnetocaloric effect as well as the simultaneous tunability of the two magnetic transitions make these materials promising for future cooling applications.
Show PACS
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.30.Sg Magnetocaloric effect, magnetic cooling
75.80.+q Magnetomechanical effects, magnetostriction
75.50.Dd Nonmetallic ferromagnetic materials

Origin of antiferromagnetism in CoO: A density functional theory study

Hui-Xiong Deng, Jingbo Li, Shu-Shen Li, Jian-Bai Xia, Aron Walsh, and Su-Huai Wei

Appl. Phys. Lett. 96, 162508 (2010); http://dx.doi.org/10.1063/1.3402772 (3 pages) | Cited 1 time

Online Publication Date: 22 April 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We have investigated the origin of antiferromagnetism of CoO in the rocksalt structure using spin-polarized density functional theory calculations. We find that in the rocksalt structure, the superexchange interaction between the occupied and unoccupied eg states plays the dominant role, which leads to an antiferromagnetic ground state, but the system also has a strong direct exchange interaction between the partially occupied minority spin t2g states that leads to the unusual situation that the ferromagnetic phase is more stable than most antiferromagnetic configurations.
Show PACS
75.30.Et Exchange and superexchange interactions
75.50.Dd Nonmetallic ferromagnetic materials
71.15.Mb Density functional theory, local density approximation, gradient and other corrections
75.50.Ee Antiferromagnetics
72.25.-b Spin polarized transport
75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close