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SUMMARY:Layered Quasi-two-dimensionalMagnetism - Study of the Magnetic Pha
 se Transition
DTSTART:20261125T080000Z
DTEND:20261125T110000Z
DTSTAMP:20261111T230100Z
UID:indico-event-9916@indico.fysik.su.se
DESCRIPTION:Speakers: Yuqing Ge (KTH Applied Physics)\n\nOpponent: Catheri
 ne Pappas\, Faculty of Applied Sciences\, Delft University of Technology\,
  Mekelweg 15\, 2629JB Delft\, The Netherlands\nSupervisor: Martin Månsson
 \, Ljus och materiens fysik\; Yasmine Sassa\, Ljus och materiens fysik\nAb
 stract\n  This thesis investigates phase tuning in several quasi-two-dime
 nsional magnetic systems using neutron diffraction\, 𝜇+SR\, and other b
 ulk magnetic measurements. \n  The motivations and the basic background 
 of magnetic interactions are given in Chapter 1. A background and existing
  knowledge of these systems are presented in Chapter 2. The techniques\, e
 xperimental methods\, and mathematical tools are explained in Chapter 3. M
 ain experimental results and interpretations are presented and discussed i
 n Chapter 4.\n  Two van der Waals magnets and one magnetic multilayer thi
 n-film system are studied in their ground states and under tuning paramete
 rs\, including pressure and depth within the film. At ambient pressure\, C
 rCl3 is shown to have a distinct 2D spin-spin correlation below the transi
 tion temperature. Under pressure up to 23 kbar\, pressure suppresses both 
 its transition temperature and its ambient-pressure magnetic phase\, while
  inducing a new magnetic ground state. Measurements of VI3 at ambient pres
 sure confirm the presence of multiple magnetic phases and weak spin cantin
 g.  \n  Persistent spin fluctuations have been measured in SmI3 down to 
 a temperature of 40 mK at ambient pressure. A moderate pressure below 20 k
 bar changes the nuclear structure\, resulting in quasi-static short-range 
 magnetic order. This provides a solid example of the effect of hydrostatic
  and chemical pressure on the crystal field. High-pressure 𝜇+SR measure
 ments of the Shastry-Sutherland compound SrCu2(BO3)2 confirm the absence o
 f long-range magnetic order up to 24 kbar and indicate changes in the Cu s
 pin fluctuations above 21 kbar\, consistent with the formation of a plaque
 tte phase. Topological skyrmion tubes in CoFeB/Ru/Pt are investigated usin
 g low-energy 𝜇+SR  to study potentially diffusive or mobile skyrmion d
 ynamics. Further depth-dependent experiments probe the variation across th
 e thin film of the skyrmion tubes and stripe tubes resulting from the long
 -range dipole field. \n  Finally\, conclusions and outlook are discussed
  in Chapter 5.\n\nhttps://indico.fysik.su.se/event/9916/
LOCATION:Pärlan (Albano Building 1)
URL:https://indico.fysik.su.se/event/9916/
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