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Crystal clear: Understanding magnetism changes caused by crystal lattice expansion

The pattern of arrangement of atoms in a crystal, called the crystal lattice, can have a huge effect on the properties of solid materials. Controlling and harnessing these properties is a challenge that promises rewards in applications such as novel sensors and new solid-state devices. An international research collaboration, including researchers from Osaka University, has reported the induction of an interesting type of magnetic order, called helimagnetism, in a cobalt oxide material by expanding its lattice structure. Their findings were published in Physical Review Materials.This is a schematic illustration of the helimagnetic-ferromagnetic transition driven by the lattice expansion/compression in the cubic perovskite Sr1-xBaxCoO3. Credit: S. Ishiwata and H. SakaiMagnetic behavior results from the order of the magnetic moments of the many individual atoms in a material. In helimagnetism, instead of the magnetic moments being aligned–as they are in permanent magnets, producing ferromagnetism–the moments arrange themselves in a helical pattern. This behavior is generally only observed in complicated lattice structures where different types of magnetic interactions compete with each other, therefore the report of induced helimagnetism in a simple cubic cobalt oxide structure, is highly significant.“We have shown emergent helical spin order in a cubic perovskite-type material, which we achieved simply by expanding the lattice size,” study first author Hideaki Sakai says. “We were able to control the size of the lattice expansion by using a high-pressure technique to grow a series of single crystals with particular chemical compositions. Changing the amount of different ions in our materials provided us with sufficient control to investigate the magnetic properties.”Systematically replacing strontium ions in the structure with larger barium ions caused the lattice to continually expand until the regular ferromagnetic magnetic order present at room temperature was disrupted, resulting in helimagnetism. These experimental findings were successfully supported by calculations.“The fact that we were able to largely reproduce our findings by first principles calculations verifies that the magnetic interactions in the materials are highly sensitive to the lattice constant,” Sakai says. “The more we can understand about the magnetic behavior of crystalline materials, the closer we move towards translating their properties into useful functions. We hope that our findings will pave the way for novel sensor applications.The control of magnetic order simply by changing the lattice chemistry, as demonstrated by this research, provides a foundation for investigating the properties of many other crystalline materials.

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Instant news

Release time：2018-12-07 00:00 reading：1215 Continue reading>>

<span style='color:red'>Lattice</span> Semiconductor appoints Jim Anderson as CEO

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Lattice Semiconductor appoints Jim Anderson as CEO

Lattice Semiconductor has appointed Jim Anderson as the Company’s President and Chief Executive Officer, and to the Company’s Board of Directors, effective September 4, 2018.Anderson joins Lattice from Advanced Micro Devices (AMD) where he served as the General Manager and Senior Vice President of the Computing and Graphics Business Group and brings with him a broad technology industry experience and a strong track record in terms of business transformation.Commenting, Jeff Richardson, Chairman of the Board, said, “Jim Anderson brings a strong combination of business and technical leadership with a deep understanding of our target end markets and customers. The transformation he drove of AMD’s Computing and Graphics business over the past few years is just a recent example of his long track record of creating significant shareholder value. “Anderson who said that Lattice has a “compelling combination of ground-breaking hardware and software solutions, global reach, and talented employees that forms a strong foundation for industry leadership and success,” brings 20 years of broad technology industry experience across many markets, including consumer, enterprise/datacentre, and telecom.In his role leading AMD’s Computing and Graphics business group he drove a strategic and operational transformation that brought disruptive new products to the market and delivered market-leading revenue growth and significant profitability expansion for AMD.Prior to AMD, he held a broad range of leadership positions spanning general management, engineering, sales, marketing, and strategy at companies including, Intel, Broadcom Limited (formerly, Avago Technologies), and LSI Corporation.

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Lattice Semiconductor

Release time：2018-09-04 00:00 reading：3262 Continue reading>>

<span style='color:red'>Lattice</span> Semi Names Ex-AMD Exec CEO

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Lattice Semi Names Ex-AMD Exec CEO

Lattice Semiconductor named former AMD executive Jim Anderson its president and chief executive, effective Sept. 4.Anderson, who since 2015 was the general manager of AMD's computing and graphics group, succeeds Glenn Hawk, who had been serving as Lattice's CEO since March, when Darin Billerbeck announced his retirement.Jeff Richardson, Lattice chairman, said through a statement that the transformation Anderson brings a strong combination of business and technical leadership with a deep understanding of Lattice's target end markets and customers."We are excited to bring Jim’s proven leadership to Lattice as we accelerate all aspects of the company in order to capture the enormous opportunity that lies ahead,” Richardson said.Hawk, who has been Lattice's chief operating officer prior to becoming interim CEO, has agreed to stay with the company as a special advisor through Oct. 31, Lattice said."Lattice has a compelling combination of ground-breaking hardware and software solutions, global reach, and talented employees that forms a strong foundation for industry leadership and success," Anderson said.Prior to working at AMD, Anderson held a range of executive positions spanning general management, engineering, sales, marketing, and strategy at companies including, Intel, Broadcom (formerly Avago) and LSI Corp. He holds an MBA and two master's degrees in computer science, as well as four patents for innovations in computer architecture.

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Instant news

Release time：2018-08-29 00:00 reading：1285 Continue reading>>

Canyon Bridge Head Charged With Insider Trading in <span style='color:red'>Lattice</span> Deal

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Canyon Bridge Head Charged With Insider Trading in Lattice Deal

　　The managing partner of Canyon Bridge Capital Partners, an investment firm funded in part by China's central government, has been charged with insider trading in connection with the firm's failed bid to acquire chip vendor Lattice Semiconductor.　　Benjamin Chow could face up to 30 years in prison and a fine of up to $5 million after being charged with 13 counts of securities fraud and one count of conspiracy to commit securities fraud, according to a statement released by the U.S. Attorney's Office for the Southern District of New York.　　Authorities accuse Chow of tipping off a friend about the potential acquisition by Canyon Bridge of Lattice prior to that information being made public. The friend — identified only as a partner at a private equity firm based in Hong Kong — used information supplied by Chow to make stock trades that netted about $5 million in profits, according to the allegations contained in the indictment filed in federal court in Manhattan.　　A spokesman for Canyon Bridge said, "We are aware of the indictment charging Mr. Chow with violations of US securities laws. Mr. Chow’s Counsel has stated that Mr. Chow denies the allegations of the indictment and that he intends to defend the case in a court of law."　　While the U.S. Attorney's Office did not name Chow's alleged co-conspirator, the U.S. Securities and Exchange Commission in February charged Michael Yin, a Hong Kong based partner at Summitview Capital, with insider trading in connection with the Lattice deal.　　Canyon Bridge announced last November a deal to acquire Lattice for $1.3 billion. However, the deal underwent a lengthy national security review by the Committee for Foreign Investment in the U.S. (CFIUS) amid concern about Chinese entities buying Western technology firms by first the Obama administration and then the Trump administration. Trump ultimately blocked the deal in September on the recommendation of CFIUS.　　Canyon Bridge, which is headquartered in Palo Alto, Calif., has since announced a deal to acquire U.K.-based Imagination Technologies for $675 million. On Tuesday (Oct. 31), Imagination announced that shareholders voted to agree to the takeover by Canyon Bridge. A court hearing to approve the deal is scheduled for next week.　　"Chow’s illegal tips resulted in multimillion-dollar profits for his friend and business associate," said Joon H. Kim, the acting U.S. Attorney for the Southern District of New York, in a press statement.

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Canyon Bridge Head,Insider Trading,Lattice Deal

Release time：2017-11-02 00:00 reading：2408 Continue reading>>

With Acquisition in Doubt, <span style='color:red'>Lattice</span> Appeals to Trump

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With Acquisition in Doubt, Lattice Appeals to Trump

　　After a lengthy review, the Committee on Foreign Investment in the United States (CFIUS) has informed Lattice Semiconductor Corp. that it will recommend that U.S. President Donald Trump block the proposed $1.3 billion acquisition of Lattice by private equity firm with ties to the Chinese central government.　　Lattice (Portland, Ore.) said in a regulatory filing that it as well as its would be buyer, Canyon Bridge Partners, would continue to engage Trump and CFIUS to "explore measures that may resolve any outstanding national security concerns and that could allow the parties to proceed with the transaction."　　Canyon Bridge agreed to buy Lattice for $1.3 billion in cash last November. Despite shareholder approval of the acquisition, the deal came under scrutiny from CFIUS — a multi-agency U.S. government committee that reviews acquisitions for national security implications — amid rising U.S. caution over China's ambition in the global semiconductor industry.　　A group of U.S. lawmakers last year wrote a letter urging Jack Lew, then U.S. Secretary of the Treasury, to block the deal on the grounds that it represented a threat to U.S. leadership of the semiconductor industry.　　The CFIUS review dragged on far longer than is typical. Lattice and Canyon Bridge re-filed paperwork with CFIUS on the proposed transaction multiple times in an effort to receive clearance.　　Under U.S. law, CFIUS does not comment on its investigations or reasons for its recommendations. Trump has 15 days to either suspend, prohibit or approve the transaction. The Reuters news service reported that a U.S. president has never before gone against the recommendation of CFIUS on a proposed acquisition.　　In a regulatory filing last week, Lattice said it remains hopeful that Trump will allow the merger to be consummated "given the benefits of the proposed transaction to Lattice’s stockholders and employees in the United States, and the substantial mitigation measures proposed by the parties."

Key word：

Acquisition, Lattice

Release time：2017-09-06 00:00 reading：1181 Continue reading>>

model	brand	Quote
BD71847AMWV-E2	ROHM Semiconductor
CDZVT2R20B	ROHM Semiconductor
TL431ACLPR	Texas Instruments
RB751G-40T2R	ROHM Semiconductor
MC33074DR2G	onsemi

model	brand	To snap up
IPZ40N04S5L4R8ATMA1	Infineon Technologies
STM32F429IGT6	STMicroelectronics
BP3621	ROHM Semiconductor
TPS63050YFFR	Texas Instruments
ESR03EZPJ151	ROHM Semiconductor
BU33JA2MNVX-CTL	ROHM Semiconductor

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